I have recently started thinking about the use of quantum computer for gaming but the ideas are still in primitive phase. For classical computers, one of the ideas I have is of a truly open world representation of planet earth with all the civilizations and culture.

The major problem was always data. Where would you store such plethora of models, textures and all the assets. You can now think of AI as a massive data compressor. You can train it on terrabytes of information from all around the world, every city and corners, people, dresses and so on. We've pretty much already trained it for people and random landscapes, we just have to add earth's geographic training to it, something like microsoft did with flight sim but more detailed.

The game can then procedurally generate the place with random vietnamese NPCs as you walk the streets of Hanoi with accurate topology and structures. This is doable within this decade.