It's just that artists, writers, musicians and game developers still need to make a living.
The big media corps aren't much better at this than the pirates are unfortunately. Other than the odd mega-star-of-the-month that comes along whenever the current top40 sales start slacking. The vast majority of that CD purchase you just made goes to the various levels of distributors. The artist gets almost none of it (which is still better than actually none, but only slightly).
Ok, how does that invalidate the concept of intellectual property?
It doesn't at all. It just highlights the fact that the current implementation of intellectual property has been deeply corrupted from its original purpose of providing creators an incentive to create.
I don't really see Anonymous as being a positive force for change. I actually disagree that the internet needs anonymity as a shield (Gabe's Internet Fuckwad Theory, etc) and while it's pretty goddamned amusing to see people get kneecapped when they fall victim to hubris, a lot of the time they're pretty childish about it.
Well, put it this way: I just saw a Bill Maher commercial about a live show streamed from Yahoo when he said "It's totally free, because if it wasn't, you'd find a way to download it illegally anyway".
Furthermore, we already have the DMCA. Ever tried downloading porn and either in the forum, you get a message saying "Post removed due to complaint of copyright owner" or when you click the link to go to rapidshare/filesonic/depositfiles/what have you, you get a message saying "this file was deleted due to copyright complaints"?