I would love like a "Live you life in Skyrim" expansion, where they work more on the family part and housing part.. For example, buying a mine and start up a small shack, find a huge gold vein and getting a small fortune, hire people and see your community grow, or set up a mill next to a river and grow a community that way.. Save it from raids from bandits, vampires and dragons.. Escort the caravan to the nearest city..
This is something you can do anytime in the game, even if you do the main Q line
Thats the ultimate RPG if you ask me and please keep this serious!
