Taking one site down will not make any difference. People will just go somewhere else for their torrents.
For every one that they shut down two new ones will pop up to fill the void. This is a losing battle on the side of the copyright holders. (kind of like drug prohibition in America).
Besides, these sites are providing links to torrents, not the actual files themselves. I don't see how they could be held liable. After all, the links are already out there, they just put them together in a large database that's easily accessible. The bottom line is that the information is already out there in cyberspace and there is no way to reel it back in. The internet has become way too massive to even attempt something like that.