I think artists should be paid by endorsements - like the old times, when barons would pay an artist to create a work of art. Only now, we can have people from the internet chip in small amounts. I.e., an artist proposes some art, and those who wants it can promise payment. Once the art is made, an infinite copy can be created, and every and anyone can access it.
So what incentivizes people to pay that initial bit, i hear you ask? Some people, especially fans, don't mind paying it. And that is where the value is extracted from.
Same question can be asked of any salaried worker.
Anyway, once said artist has got some experience and built up their portfolio, there's nothing stopping them from leaving the organisation to work freelance (and be paid by endorsements). The organisation idea was really just a middle tier to allow people to pool their resources and share the rewards, including allowing new artist a way to get into the system.
o what incentivizes people to pay that initial bit, i hear you ask? Some people, especially fans, don't mind paying it. And that is where the value is extracted from.
Recently kickstarter has been proving this to be true! Also the success of the humble indie bundles suggests this is true.
Form organizations which take the money and pay the artists salaries. Now becoming a new artist becomes similar to becoming a new programmer or architect or whatever.