I think thats kind of the point though, its more or less become an archive already, albeit a somewhat poorly organised one in archive terms. If people don't add new stuff then it might as well be a static source of information.
I think things might have become based a bit too much on the concept of answering questions from people who never come back, or who understandably want a quick fix and the topic never gets discussed any further, and not enough about presenting work that you've done or ideas that you've had. It becomes a bit of a downward spiral when people do present stuff they've done, but theres not enough people around on the forum to comment on it, so nobody bothers showing stuff off anymore.
Don't get me wrong, theres always space for questions as that's what forums are about, but it generally helps if they actually lead to a discussion.
It could be as electoyd suggests in that the beginners who come here find a whole lot of information already available and don't feel the need to post, but i'd also suggest that people who have been doing this a while have tended to move onto other areas like building modular synths etc. Maybe the name circuitbenders might actually be holding things back when it comes to a forum these days.
I'll have a think about a possible reorganisation, but i think that having all the 'how to's' etc in one place might just make it more difficult to find what you want in that section, and make it less likely that people will post. It could be that theres just too much information on here and we do need something more along the Burnkit2600 lines.
I think that a very large number of forums around the net have been slowing down or dying recently, and not just due to social media, but that is causing it to an extent. Maybe circuitbending has just reached saturation point.