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AI so sophisticated that the human has no role even for the "creative" partsThat is a crucial point that is often missed by people outside of the industry. There is nothing magical about activities that don't require the assistance of a computer today. The very principle of computability applies equally to any activity, not just mathematics.
In a way, art is the product of a very complex Turing machine that relies on physics and biology to compute it.
We are already seeing impressive pieces of art coming out of silicon computers, DeepArt being an example: https://www.facebook.com/deepart.io/.
It is, to me, extremely likely that within 20 years, we will have generated novels compete on the market with best-sellers.
The creative process will increasingly rely on mastering and combining more and more exotic techniques, and that may require a deep understanding of the new tools at hand.