My hope is that AI can be used to not just build outwards but to build inwards; and assist devs in doing things they never could have done before. Like making most interiors in the likes of GTA not just enterable but tying them into game systems and the overall simulation so that you feel like there's no barriers as you peer into the world. In addition, they'd appear highly variable by using morphed and modular assets with a vast array of style variables.
This is a slightly different realm but I envision it as devs building a building 'shell' as they normally would. Then tagging that building as a certain type or subtype (hotel, home, office etc) that an ai-procedural toolset will recognise. For each of these types the devs/artists will provide a set of example layouts/designs from which the system will learn. Said system will be aware of windows, doors etc. and any bespoke transitional spaces. The ai-procedural system will then fill out these buildings according to the types, using the artist examples; making it artist-driven. Over time certain layouts/variations could be rated/approved/disapproved and in turn the system will learn; in turn becoming better. Further embellishment could then be done on near-final results to varying degrees; these embellishments could themselves feed back into the system. This would effectively run as a virtual conveyor belt to be ok'd and qc'd during dev. Each room would have a seed for persistence.
Once everything is constructed, various gameplay systems could be tied into these spaces with the tagged "types" influencing NPC behaviour within them as well.
I don't wanna shake off the cops in GTA by going round the block and hiding any more. I wanna enter a hotel, take the lift and go haul myself up in a room, during which, as I enter all these nooks and crannies, I wanna feel like I'm peeling back the curtain on the lives of NPCs: before I enter said room I knock on the door and show a fake badge (other options include picking it and blowing it open), they let me in and I hold the guy up, his wife was sat on the sofa watching TV but now she's cowering in the corner. I bash a door open on the way through and some guy is just sat there taking a dump, he runs waddling into the living room corner with his pants round his ankles and the guy I'm holding up joins him. I proceed to steal their stuff to sell later. Then, a SWAT team comes to hunt me down, but I've stuck C4 in the hallway and I'll blow 'em up. Then I'll make my way to the roof, jump off and open my chute, land on a boat in the river, steal it and make my way back to the safehouse.