Even though it's not AI, this is already happening with a lot of content farms. There was a good video a couple years ago from Ann Reason of "How to Cook That" that basically pointed out how the visually-appealing-but-not-actually-feasible "hands and pans" content farms (So Tasty, 5 Minute Crafts, etc.) were killing genuine baking channels.

Imagine that instead of having cheap labor from Southeast Asia churn out these videos, that instead they are just spit out as fast as possible using AI.