Shaddows - 2:29 pm on Apr 15, 2011 (gmt 0)
The Google forum is pretty busy atm. Foo too.
The fact is, there is now a large repository of information on these boards - the same questions do not need to be asked again and again.
Social Media is surely taking a chunk of would-be members too. Just join a group. In addition, the "normalisation" of internet use means there are more places to meet like-minded people, and more categories of "like-mindedness" over which people can meet.
In short, competition (as resource and as social tool) has vastly increased, and the requirement to actively participate has decreased. But it's still Best in Class.