If I'm an artist I still need food, shelter, and to buy things in the real world. If I can't make money making digital assets then that heavily disincentivizes me to make them.
Of course in your scenario we haven't reached the "endgame of economics" that we're currently speculating about, because there still is real-world scarcity.
Luckily, I don't think this is an issue that we need to have consensus on. Even if 95% of the world thinks that NFT's are silly, if 5% wants to use that model to fund the creation of things that they like, there will still be a market for your tokens.
