I love playing/writing interactive stories with an AI. A dream game of mine would be an RPG/Adventure game that extends this to a fully realized game that adapts to how you want to play.
Want to be the adventurer who slays the evil monster and saves the kingdom? Go right ahead!
Prefer to stop halfway, settle down and become the village baker, getting involved in the town's intrigues? Also fine!
It would probably be too much to ask to turn this into a full-fledged 3d world with high detail. But a consistent Visual Novel would be a really great next step.