Ok, I've thought about this A LOT. Here is -my- list of things that -I- think needs to change/improve for the next game. It's long, sorry about that, and it might be similar to some others, but, oh well.
First of, smithing and enchanting needs improving. For instance, when I smithed a glass sword and armour, I would grind gold objects just to increase my smithing to craft the next armour, and never bothered with more glass-epuipment. There should perhaps be multiple degrees of crafting things, even if they just use the old -fine- och -pure- bla bla bla. Edit: I don't mean the same as improving into flawless etc through gridning stones. I mean multiple weapon/armor per materiall. In Dawnguard you had to craft a Crossbow and then use that crossbow as materiall for the nest version, Enhanced I think and so on, which would be neat to use on every type of equipment. Enchanting is probably obvious, it needs more freedom.
Spells need expanding as well. Many miss the make you're own spell-thing, but I fell it isn't necessary, just so long as you have enough spells to make up for it.
Stamina should be important. I just started playing morrowind for the first time, and it is quite fun and part of the fun is conserving stamina. They went a little over the top at times, but all in all a fun system.
hardcoe mode. It was there in Fallout Vegas and it was fun. I like to be led by the hand a little the first time around, but it's nice to be able to make the hole thing more difficult and immersive. Those who complain about fast-travel and what-not can have it removed in hardcoe mode for instance.
Underwater combat and exploring. This is why I was looking forward to argonia which I believe was but a rumor? I usually HATE water levels, but it is at the same time a love-hate-thing. It wasn’t good in Oblivion, but it was there. I get it, immersive-wise, why Skyrim didn’t have that, cold water and all, but the next game should really have it.
Fame-infamy-quest relation and faction advancement. In the companions for instance, one needed only to do one raidant quest or job or whatever thay are called before recieving a major quest. That is just to fast. And it is to easy to join guilds. You should have to have a certain amount of fame or infamy before they let you in and have fame from the work inside that guild as well. Often I meet NPC who compliment me on joining the Winter Collage in Skyrim, even though I havn’t done even the first quest there, only joined for entrance which is required in the main quest.And the main quest should not require you to mingle with other guilds!
Better follower AI. That’s it. They trigger every trap, svck at sneaking and attack enemies I try to avoid. Stop it. Tsst.
Better transform powers. I didn’t like the werewolf, any of it excpet the idea. It was a cool thought, but without DLC it was only fun the first few times and with it still felt kinda… meh. I loved the vampire-tranform, even if the animation could be a bit clunky in my opinion. But I felt as though I –should- be overpowered in those states, yet I felt stronger in my natural form. Vampirism och lycantropy shouldn’t be a weakness. Sure, walking around in daylight should weaken them, but in their true form under the night, nothing should stand in our way, muhahahaha-
More important deadra. In Oblivion, one of the lords or whtanont (cant remember) wgaed war on Cyrodil. Still no other deadra hade any importance I felt. They should affect more, perhaps earning their favour could be one of the main plots or something. I just feel that they don’t have any real importance, despite being (Gods? Not into the lore to be honest). And the actuall gods should have something akin to deadric quest. Talos may be the cause the wars in Skyrim, but the gods have no impact otherwise. Their blessings dosesn’t even do much. Speaking of…
Permanent buffs. I like the permanent effects like Prowlers profit etc and i think they were loads of fun. But there were so few. Perks made up for that, but I think there could be more permanent buffs. Instead of giving my swordsman a two-handed axe for a hard mainquestline quest-reward, give me a buff related to the quest
Customaization. I play on Xbox and i would like my next game on console as well. Modding is impossible for me so I can’t wait for someone to add a nice RaceMenu or something. Vanilla game should have a lot more customization, not to say I didn’t like Skyrims. Not just physical apperance though. Clothes that does nothing would be nice to wear over or under armour. Those types of equipment shouldn’t be enchantable though, unless the game is extremely diffifcult.
Clothing. Now that I’ve mentioned that, cloth or unarmored should make a comback. Mostly because wearing mages robes seems pointless. Unarmored could perhaps decrease magicka cost or increase damage, or wearing other armor could do the opposite without the correct perks.
Menu UI. Again, I play on console and the sorting was a bit lacking in Skyrim. The ability to sort by weight, value etc was nice in Oblivion. And favorite menu could be improved. I’ve seen modded games with favorites that was sorted by magick, weapon etc and that would be usefull.
Persuasion. I noticed it was different in Morrowind from Oblivion in how persuasion works but I liked them both. The Oblivion persuasion wheel with the ability to taunt someone into attacking you from Morrwind is a fun idea that was for some reason dropped. Perhaps I’m the only one to enjoy it?
Creatures. Having a larger world is fine and all, but I can live with a Skyrim or Oblivion-sized world in exchange for more creatures and NPC-bandits etc. After a while, it gets boring in Skyrim.
Controlled leveling. In Oblivion I liked to hold of on leveling till I’ve trained for that level and gotten all gear I liked. The sleeping in order to level deal in Oblivion was nice. It doesn’t need to be sleeping, but you should be capable to controll it. And you should be able to chose how to tackle obstacles. For instance, in Skyrim you either need a key or lockpick to open chests. Using magic should be an option, as well as a warrior styled thing, perhaps bashing it open somehow.A warrior or mage shouldn’t have to use stealthy skills to get to the loot. But skills might be a needed thing to join some guilds? Not sure about that, but it might be a good idea. Joining the thieves guild in Skyrim was annoying for me, cause I hade no experience in pickpocketing.
Immortal NPC. Many have problems with this. I understand why Bethesda made some NPC impossible to kill, though many glitches ruins quests anyway. But I still think they could’ve worked around it. For instance, there are ghosts in Skyrim. Instead of making ghosts hostile, make them ”immortal” (that –would- make sense) and make it so when an NPC dies, they come back as ghosts. Or is that to much? I don’t know much about programing, but it seems possible.
Oh, one last thing. Quest items should be removable. Not sellable, but should appear in sell list. When you try to sell the NPC will say something like, that looks important or i want nothing to do with that, and if you try to drop it a warning window should appera perhaps, but you should be able to drop or remove them.
I'm not expecting much, but these are some things that could be in the next game, in my personal opinion. Though, in all honesty, even if the next game was perfect and had all things people want in it, some will still find things to complain about. I take it as it is, knowing that the next Elder Scrolls WILL be awesome, no matter what anyone says.