I do think that 10 years is probably a bit too short, but I do think that copy write law is badly in need of reform to shorten it's life. (I do like the idea someone mentioned earlier about having to renew it every 10 years, with a slightly higher cost each time, and I would assume with some eventual point at which it could no longer be renewed).
I certainly do see the value in copy write, (Not to assure that we have music and books and movies, and everything else, because people will always make those, but to assure that we have people who can devote their lives and time to doing so and get paid enough to make that worthwhile, thus ensuring we have *better* music, books, movies etc.), but I don't think it's current state is reasonable. I do think things eventually need to enter the public domain, and it needs to be within a reasonable period of time.