Hm. Nowadays a lot of games look alike. They use some 3D-Engine and most of the work is in the 3D-modelling and writing some interesting scripts.
For modelling and scripting I think we're not far away. A lot of games just reused old historical stories or fiction and a lot of stories feel like cheap soap operas. As soon as an AI can separate the good from the bad scrips it'll be mostly done.