Comment by jMyles
I do not think it's creators that are the constituency holding up deprecation.
As a full-time professional musician, I'm convinced I'll benefit much more from its deprecation than continuing to flog it into posterity. I don't think I know any musicians who believe that IP is career-relevant for them at this point.
(Granted, I play bluegrass, which has never fit into the copyright model of music in the first place)