Any ways I got this idea from another thread I just read about the same topic. I'd post a link but my phone is stupid and won't let me for some reason.
The thread pretty much talked about taking oblivion as if it were just a demo for what TES IV could/should have been.
So I was thinking you take what we already have put it in the new engion and update every thing. For instance take the battle of Bruma. What we got was spending hours closing oblivion gates to get all the towns to send help for Bruma then you get back expecting to have some epic ass battle only to find out that there's like 10 people Like wtf man. But with it being updated for new consols we might get that epic lord of the rings style last stand kind of battle I was emagining the first time I did that quest.
Keep all the main quest actors like Sean bean Patrick Stewart and all the other famous actors. Then just add in a way more voice actors like way more than even skyrim has. Rewright the dialogue but keep the same story and concept just execut it better.
For the mages guild quest line they could completely redo Manimarco and actually make him a boss worth the name. Cause for real I kill him in like 1 - 2 hits every time. And while there at it redo all of the mages guild quest. Make it more of a challenge to get to the Arcane University instead of one quest from each guild hall. Make each guild hall a quest line of its own or actually make them schools that train you in that halls specialization. Also while on that note bring back morrowinds skills have to be at certain levels in order to advance to the next rank. Which would make each guild hall being an actual school viable. Then and only then when you make it to the AU would you start the Mages guild quest line of course after you've made up in the ranks forst.
The schools would be some thing like how the college of winter hold starts off were your actually being taught how to do and use spells and going on field trips to ruins to study them and find artifacts. Non of that one lesson then field trip then oh I guess your the arch mage now bs.
Now cities need to be actual cities so they would have to be way bigger especially the IC.
Any way those are some of my ideas for a remake let me know what you would want or how you would changes things if you had it your way.
And one more time I know this will never happen its just wishful thinking on my part and those that are like minded so please no negative comments on how it won't or never will happen please.