The thing about it, though, is that human interaction with the computer will continue to push the art beyond what the computer can do on its own. Even if a computer can create a fully-realized piece of "art," a human operator building on that will be able to make much more out of it.

In my own particular line of work (visual effects for film and television), there are a number of systems that can do automatically what used to take hours of artist labor. That hasn't reduced the demand for artists, though. On the contrary, visual effects budgets continue to climb as the bar for professional work continues to rise.