The question that I pose to the Elder Scrolls forum in general is this: What, if anything, should Bethesda keep from previous games to make TES: V (and beyond) better than its predecessors? This can include any element from any game that Bethesda has developed, including Fallout 3.
To give an example, I'll give a few of my personal choices:
Stealth from Fallout 3
Combat mechanics from Morrowind
Combat animations from Oblivion
Leveling system from Daggerfall
Character creation from Daggerfall
Theft from Morrowind
Open gameworld/cities from Morrowind / Fallout 3
Horses from Oblivion (tweaked for improvements)
Spell and alchemy failure from Morrowind (tweaked to make it less severe)
Magicka regeneration from Oblivion
Skill options from Daggerfall
Graphics from Fallout 3
....
I can go on, but I hope everyone gets the general idea.
What I'm hoping for is a civil discussion about what Bethesda has done right, and what they should retain, or 'remodel', from previous games rather than 'rebuild'. It is okay to discuss merits and faults of any particular system or element, or how they should tweak something to make it 'perfect'. However, I really don't want to see this turn into a Game X vs. Game Y discussion. So, again, please remember that your opinion represents your personal preferences, and may not resemble the opinion of others.