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The usual argument is either through patronage/sponsorship by some entity with the money to spare that enjoys their art, or by working in another field and making their art essentially as a hobby.
Whether that is a good thing or not is a much more complicated question, and I suspect we'd have a lot less technically skilled artworks if there was no way for an artist to develop those skills in their primary profession.
Sponsorship and patronage may be the way to go, but that risks the possibility of discouraging artists from producing any works that may offend their sponsor. The similarity to academia with grant funding and tenured professorship is quite clear.
What is probably a novel approach is essentially the pay-whatever-you-like, or "distributed patronage" movements that have been occurring more and more recently. The problem then is shifted to gaining popularity/mind-share sufficient to fund the artist.
