This is a very interesting use case of the Generative Agents project.
I feel like this is just one of the earlier attempts at creating an interactive experience with this, but there's still so much potential for future games, if the technology is refined further. Think of something like Animal Crossing (or any other game where interacting with NPCs is at the forefront of gameplay), but with the characters that have completely unique personalities and an ability to generate new dialogue (rather than relying on a limited number of pre-written lines), or react to player actions in unique ways, and so on.