1--(the ability to reset or restart quest chains to play them again on the same character.
2--(the ability to reincarnate a character into a different class, other skill lines would remain the same but character would revert to level 0 in the new class. all other progress within the world would remain (quests and such still completed) this could be done multiple times once the character hits level 50 again
3--(monster play, the ability to play as a daedra in a fourth daedric faction in cyrodil (like Lotro) complete with their own abilities and different daedra (daedroth, xivkyn, spider daedra, scamp even, etc.)
4--(a repealed and replaced CP system so that the game can stop being split between CP or no CP and power can return to the players and not the champion system.
5--(imperial city to get its own instance and queue separate from cyrodil
6--(new towns, ruins, keep layouts, terrain in cyrodil.
7a--(more interesting towns and wilderness designs, example being blackreach from skyrim, if the main cavern had a city location we could port to and the various dwemer caves that off shoot that location were there own large wilderness locations with dungeons and world bosses in them, and access points in the various tunnels to other parts of the world (so you could travel from the rift, down through a dwemer dungeon, into black reach, up through another dwemer dungeon, and out into winterhold, etc.
7b--(more interesting travel mechanics like that in general, what if we could travel up into an dark anchor in reapers march, be in cold harbor, and find and travel down and out a shadowfen dolmen, would be a lot of fun and really connect the world more.
I think that's enough for now.
NO GLOBAL AUCTION HOUSE
Fix bugs / lag / vMA/ Cyrodiil
More Guild stuff - private battlegrounds, guild team leader board, guild bank / store in GMs home
Pet control on console
Like the OPs idea of quest decisions changing your path more
Fix Fear break free
Mannequins in home to save your setup for easy PvE / PvP switch of skills / gear / CP (still take cost if Zos need the gold sink)
1--(the ability to reset or restart quest chains to play them again on the same character.
2--(the ability to reincarnate a character into a different class, other skill lines would remain the same but character would revert to level 0 in the new class. all other progress within the world would remain (quests and such still completed) this could be done multiple times once the character hits level 50 again
3--(monster play, the ability to play as a daedra in a fourth daedric faction in cyrodil (like Lotro) complete with their own abilities and different daedra (daedroth, xivkyn, spider daedra, scamp even, etc.)
4--(a repealed and replaced CP system so that the game can stop being split between CP or no CP and power can return to the players and not the champion system.
5--(imperial city to get its own instance and queue separate from cyrodil
6--(new towns, ruins, keep layouts, terrain in cyrodil.
7a--(more interesting towns and wilderness designs, example being blackreach from skyrim, if the main cavern had a city location we could port to and the various dwemer caves that off shoot that location were there own large wilderness locations with dungeons and world bosses in them, and access points in the various tunnels to other parts of the world (so you could travel from the rift, down through a dwemer dungeon, into black reach, up through another dwemer dungeon, and out into winterhold, etc.
7b--(more interesting travel mechanics like that in general, what if we could travel up into an dark anchor in reapers march, be in cold harbor, and find and travel down and out a shadowfen dolmen, would be a lot of fun and really connect the world more.
I think that's enough for now.
3rd one sounds interesting on a personal level.
Mine would be take a page from the Witcher 3 and Divinity Original Sin 2 and have dynamic quests with multiple options and multiple endings. Change the main story slightly having 10 soul shriven instead of one to fit the mmo aspect of the game. Fixing the performance in pvp. I honestly think if they did this, this game would be hugely addictive and popular