Hrm, I do think that AI would be able to create narratives that humans find more enjoyable than the work of other humans, and I agree that AI would be able to create pictures and sound that humans find to be more enjoyable to look at or hear than the raw work of humans. AI can master the technical feats of composition and art.
But what I doubt AI will ever be able to do is create art that speaks to us. It wont ever be able to create a Guernica. It wont be able to create a Crime and Punishment. It wont understand what it is to be human and mortal, what suffering is, and it wont be able to look within itself and find what those things mean to it and then share that with us, because in the end it's just a bunch of code running statistical computations. It wont fear death, it wont have children it cares about or a family history to look on and tell us about. It has nothing of emotive value to share.