Owning your own business (bar/restaurant/library...)
I know this won't be a thing on release, but given how highly and realistically customizable everything is in the game, I hope owning a business/shop in the game will become a roadmap feature at some point. Even a DLC if made well.
This could add so much to the game and I'm sure it would interest and attract a LOT of players. Owning your own bar, restaurant, library, etc. Being able to customize them, place orders, manage prices (which impacts the kind of customers you get), employees (each having their talents, weird flaws and qualities), serve your customers with day to day events, and so much more.
There is so much to do, the game as it is already being a good basis, they could dive into this and release it as a well worth DLC.