Somewhat of an aside - it occurs to me there's an analog in population ethics here, e.g. Parfit's "Repugnant Conclusion".
Would you rather have a few people thriving and the rest not doing so well? Or is it better to have more people doing marginally better, at the cost of those few thriving exceptionally?
And the people most likely to use AI to copy artists probably wouldn't have hired the artists in the first place. Some people are losing on opportunities, but I think. in most cases, those opportunities didn't exist to begin with.
They might release fewer pieces publicly out of style-copying fears. Or if they get paid less they might have less time to spend creating art.
Personally I think generative models enable more people to make art and may even let professional artists create more art.