I think one of the reasons that nobody who "matters" in this debate agrees with points like this is that nobody is being forced to buy content. If you don't want to pay for Miley Cyrus, don't listen to it.
If copyright contracts naturally occur in a free market, than I am willing to concede that.
However, it seem to me that copyright has power to reach third-parties, not those who are originally involved in an transaction between authors and buyers.
EDIT:
I made it very clear that if nobody wants to buy from the authors, artists, programmers, the incentive to produce will suffer.
If this is what the consumer sovereign truly intended, than it is an ethical outcome and an outcome that cannot be changed.