I saw an interesting talk about proc gen which was basically saying a lot of studios are moving from hand crafting to procedural tools. For example if you want to fill a park with trees you don't place them by hand, you just specify the density and type of trees and let the computer place them. The advantage is that if you want to reshape the park later you can just click and drag. Then when you are happy you go though and hand craft more content on top.
They were saying there is a critical mass where procedural tools feed into procedural tools and a lot of the pipeline is automated, then it becomes extremely cheap to make more content.
So back to your point: I think this is where we will see AI more in game dev, it will be as smart tools to empower creators to make stuff more easily. I don't think the AI will make the game, I think it will assist the humans with the creation of it.
Here is a talk about Spiderman and how much proc gen they used there https://www.youtube.com/watch?v=4aw9uyj9MAE