They've been gone before - sometimes for months - and they've also come back before. I wouldn't write them off completely just yet. Even the linked story mentions that it's "too soon to consign the site to history."
Also, MegaUpload wasn't "legit." Come on. We all knew what it was for. That's why it was so great!
To steer this away from the direction that gives Aaron the shakes, here's some proper "legit" news about BitTorrent - the Internet Archive just announced their new mechanism to host content via over one MILLION torrents (blog.archive.org). I'm most interested in the Prelinger Archives, but it's one of those things I will probably NEVER have the free time to properly consume.
speaking as someone who spent a couple tours over there back in tenser times (75 until 78, then 81-83), I can say that the Z troops aren't going to be overwhelmed by the NKs as easy as you think. The US Army trains for just that possibility.