AI should be used for stuff like this:
Well, maybe.
There's obviously a rationale for dumping grunt work - graphical assets like rocks, trees, etc. or routine conversations with minor NPCs - onto AI, and other simplistic tasks. AIs might also be able to build simple quest loops. This potentially frees up people to do more creative stuff, and could be a boon to gaming.
Assuming AI is less creative than humans, it can work out less positively. Games as derivative as ever, because the efficiency gain is just used to reduce staffing, so there's no conversion of worker time to creativity. A final possibility is that creative decisions will also increasingly be handed to AI as well, and so games become even more derivative. But I guess at least in these scenarios games should be cheaper (in theory).
I think in practice we'll see a bit of everything, but the average will get worse. Some studios will put a premium on creativity (because I strongly believe there is a market for it), but it will come with associated cost. Some will be relatively derivative but still aim at high quality. However, I expect the main impact be will be a large expansion in mediocre to poor slop, because it heavily reduces the barriers to incompetents, chancers, scammers and the like churning out dross.