OMG how cool would it be if the sims was a virtual reality game. You put on your headset and become a sim. You walk around and physically interact with the sims world through a sims eyes. Just imagine it being like the first person camera mode in sims 4, but you actually have a virtual reality helmet and gloves and whatnot instead of a mouse and keyboard.
I think this could be a revolutionary idea. I'm not too sure how they would work build mode into this. But it would be something I would play for sure.