I don't see this being possible at all for non programmers. If AI companies have models that can generate games in 5 years, there's no way they will let other people use them. The companies with game generating models will simply become the developer and publisher.

If they can generate games, especially those deliberately addictive casual games, then they have a money printing machine. They'll just hire psychologists, economists, and testers to see which games are the most addictive and extractive- er- umm- I mean, which games are the most fun and compelling. Then they'll release those games. Further flood the games market with tripe, and probably get pretty rich doing it.