Earlier quoted context omitted.
Consider, however, that the output of these systems may not be copyrightable. So, when you move human involvement up to a higher layer of abstraction, it’s possible that the economics of the whole effort will be fundamentally transformed. Meaning, if these systems displace human artists, copyright itself may cease to be a motivator of economic activity—removing a significant incentive for the production of new art. A…
Sorry, I'm not seeing the downsides. That all sounds like a big improvement. And regarding point 2: do you think human artists are as good as they are without already having seen lots of great artworks produced by others? Human artists don't create art from an empty vacuum of nothingness either.
Art benefits humanity not only because we consume it, but also because we produce it.
Making art is part of what makes us human.