This is absolutely inevitable. Attacking file sharing will just lead to better file sharing technology. We should be thanking the RIAA and MPAA really.
Oddly enough, the top levels of the piracy chain still use FTP and IRC. Even though security improved right after the early 2000 busts, it has remained relatively unchanged since then (even taking into account the RELOADED-related busts ~8-12 months ago). But I guess it all comes down to scale.. it's easier to control the security of 100 users over the security of millions.
Sarcasm or not, it's a good point. It's hard to see a viable endgame for the MPAA/RIAA if newer file sharing technology simply routes around the obstacles they through up.
The broad trend has been toward easier, faster, more secure file sharing. Does anyone really believe that trend is going to reverse course?