It's been down for a day, and may be down for a few more. Looks like "Just build your own Internet" isn't a viable option for internet communists, everyone must learn of their peaceful ways by force.
Trying to get to Saidit redirects you to Saidit's Subreddit, in a sad state of affairs.
EDIT:It's come back up since then. Updates in the link.
To a degree, I'd agree with that. I'm personally a bit paranoid over the prospect that a few fed teams learned how to blend in. Having others continue bungling the work then serves as an effective way to give us a false sense of security.
Of course, as soon as one suggests engaging a federal crime, it's obvious. It's just creepy to think that people around you might be waiting for a chance to report you.