At the end of the day, either AI art is "good enough" (whatever your criteria are - "novelty", "soul" etc), or not. If it's not, then human-made art will continue to exist, to the extent there's demand for it. But if AI really is that good at art, it would seem that it's not really a problem from the perspective of society at large. It would be a problem for artists who rely on art as their source of income, but that's something that is fairly easy to solve, since all it takes is money.