I guess you could say the same would happen if Steemit allowed posting partial news content with links to the whole story. There are a lot of people out there that just like to blog on current news events, this would bring more people aboard and basically do the same you claim with artist by drawing new people to those news sites when they click on the link to read the whole story. Those new people would also discover other topics of interest from those contributing their writings to steemit.
I think there might be some advantage in the new EU laws coming where artists and consumer are more naturally matched. Not sure still :)