I think AI is a tool. It depends on how it's used: as support for the artist, or does it replace the artist?
People probably thought similarly about photography back then.
It is a interesting comparison. Photography used as basis for art has some of the same issue as AI used as base.
In photography you have the perspective and object all picked out. Often the colors are wrong. Artist using these as a source to paint from all have a similar look.
In AI you use a limited amount of data scraped from the internet (with or without permission) to generate scenarios. That ultimately will be kinda similar.
The human can go out and look at the world and make a unique conclusion based on emotion and personal desires. For example a monster based on a monkey. They could go the zoo and draw. Maybe get inspiration from something they saw on the way there. Looking at the monkeys in motion, how they interact gives them ideas.
I just think the human make more interesting stories when they get to use original input.