This is a solved problem: you pay them for their work, which is how artists have made money since time immemorial. The degree to which artists can make a living off their art is a function of demand and discoverability, not whether they have a payment system (they do need this, but they already have them).
I'd be curious to know what fraction of NFT enthusiasts had previously commissioned a piece of art, and of those how many were truly aghast at the dire state of payment systems without NFTs or at their inability to assert ownership via a blockchain. I suspect both are quite small.
The former is ludicrous, because Paypal/Kofi/Patreon/what have you offer a wide array of easy-to-use, feature-rich payment systems.
The latter maybe less inconceivable, but IMO it's driven by a desire to use blockchain tech for _something_, find something that it can conceivably do, and then deciding that that thing is therefore important. Personally, proving ownership and providence hasn't ever been a concern for any of my art purchases because they, like the vast majority of art, isn't worth selling a forgery of--nobody is coming to steal the forum avatar I commissioned or selling unauthorized prints of the obscure photographer I like.
This is just round three (or whatever) of blockchain being a solution in search of a problem: having failed to evangelize its wide use as a consumer payments system in general, its adherents moved on to hyping it as a solution to Enterprise IT problems (where selling bullshit is the name of the game anyway), failed to find traction (because everyone discovered it didn't actually solve any problems), and so we've circled back round to a consumer market, but now with more celebrity endorsements. It's still an effort to convince people that the blockchain version of something is much better and therefore worthwhile so that the worth of the tokens is tied to something other than transactions illegal goods and wild speculation. It's about supporting the livelihoods of people hoarding GPUs and wasting electricity to mine the tokens, not artists.