I don't care if the next TES doesn't have more items, quests, guilds or a better story, but for the love of the commnutity DO NOT make the landcape uninteresting ever again.
I want exploration to be a huge part of TES again. I want unique hidden items in ruins/caves, variouse landscape, no fast travel, and ruins/caves that ain't copy/pasted, and most of all no generated landscape.
Cities goes with this too. I want to be able to explore the city of hidden items, npc's with quests, and alot more to make the whole game interesting.