There's also the possibility they'll get better, possibly much better than humans. Given how much they've improved recently, that's a very very big possibility.
This "art is just a job we need done" take comes right after a comment about how voice acting is a uniquely human thing that AIs will never be able to do, and I'm finding the disconnect interesting.
Well, if AI is worse at art than us now, it means that we currently have a quality metric, otherwise "worse" means nothing. For an AI to get better than humans, it means that the humans are now the group that's worse at art.