This is the kind of debate that arises whenever a new technology comes by around the corner. I remember the debate about photography and paintings. It took a long time for photography to be considered a form of art just because it wasn't a human thing. Then, it became clear than taking good photos requires a lot of work and the whole paradigm began to change.

With AI, I see a similar picture. It won't be easy to determine the exact point of value. Sure proof of human is still the main factor for the value of art, but until what stage. AI keeps growing and learning. Maybe in a few years it will be able to replicate everything. Could there be a way to separate everything made by humans and machines? Would we hit this point in which every art will have to become a performance art? That would be the way to have that proof of human.

It is certainly an interesting debate.