I feel like I am very much a contributor to the problem. I'm a big lurker and can't help it, but I make more of an effort these days. I don't know whether I've gotten older or changed or the general theme of discussion in the general forum has changed, but I have a hard time relating to the topics being discussed a lot of the time.
I only posted in the MMO requests sub-section, and then migrated to general discussion, and then migrated to The Lounge. So it's been like the same level of activity all along as each sub-section decreased in postivity!