As I've seen said on quite a few blogs from various people now, this isn't really going to change anything.
When Napster came along, it was a revolution - easy file sharing. Then the RIAA comes along and shuts it down. What happens? A bunch of programmers that don't particularly like this come along and code bittorrent, gnutella, and a bunch of other de-centralized protocols. It just so happens that bt is quite easy to take down because you have to store the torrents in a central location.
It won't be long before another bunch of programmers come up with something equally as exciting - as eXeem promises to be - and then the RIAA/MPAA are going to find it pretty tough going to stop these things.
The problem with the RIAA and MPAA is that they're just too greedy. They're used to sitting there and selling CDs/DVDs/etc at vastly overcharged prices and basting in their obese profit margins, thank you very much. When something comes along that threatens to change the way they do business, they'd rather fight it than adapt and maybe even use p2p to their advantage.
The entire thing reminds me of a kid whose parents are trying to take him to get his hair cut; he doesn't want to go, so he just fights all the way. However, when he gets there, he finds it isn't so bad after all.
I really hope the RIAA/MPAA finds it ain't so bad.