As a gamer and a game developer, let me comment on your points
Checked by people for quality
You're suggesting that artists will now do art evaluation instead of art? Or Non-artists will do that? Or do you think companies will only hire art directors? If they do so, how would an artists live until they become a director? So, it's both boring and unsustainable
Give NPCs a personality - let a simple AI talk for them within defined limits, instead of having fixed responses
It's a game, not a reality simulator. How do you know some information is important for gamey game purposes if you keep reading slop that is slightly different, meandering, and infinite?
Have AI check all the paths through a game, to ensure they all work
Generative AI and "ensure" is not a good combo. Prepare for hallucinations, lies and false confidence.
Overall, yes, AI will make studios more productive, but at what cost? Deskilling people, increasing output therefore increasing competition even further, and everybody more reliant to 3-4 megacorps who are also going to pirate and illegally siphon the game source and content anyway, because they can and nobody can stop them. Don't have consumer mentality, this completely disrupts the game development food chain. Plus AI companies cause your new PC to cost a lot more.