The next Jonathan Blow is going to be massively empowered by their tools and make something wonderful. Having fewer people involved can lead to a more focused execution of their vision - most amazing indie games are like this. But yes your average game isn’t bad because it’s hard to write C#, it’s bad because it’s hard to design great unique mechanics and levels, and it’s hard to see AI helping (indeed not harming) that.
Let LLMs help you with coding. Design the game and the mechanics yourself. I can see this being an incredibly empowering tool in the right game developer's hands; but if you come into it with a token-maxxing / AI-maxxing mentality, I doubt you'll make a fun game to play.