I'm pretty sure there would not have been that many Terry Pratchett or Iain Banks books in the world without enforced copyrights (just as an example - my early life was occasionally crappy and these authors provided very many positive experiences then).
It's not the obvious copyrights that are annoying, IMO, it's the fact that large copyright holders attempt to curb/take a cut of every frigging positive externality that pops up.
Musicians who perform live could survive professionally in a copyrightless world (one way or another). Novelists and composers? I have no idea.
However, as you say, what about the Iain Banks' of this world? Well, I don't think much would change for them either. They'd write a novel, do a promotional tour, appearing for talks and signings, and hopefully sell lots of copies.
I think I'll let you respond here rather than anticipating your reply.
Maybe relevant: http://lesswrong.com/lw/ksy/follow_your_dreams_as_a_case_stu...
I do. I'd like to see copyright completely abolished. I think it does far more harm than good.