Well, clans ebb and flow all the time. USSR has always had a close-knit group of people, and sometimes they come and go. The same is true for any established and long-running community. Heck, at RTB one of our developers (ReD_eYe) fell off the internet for 2 years with almost no warning to us, and he just came back last week out of nowhere! I'm not worried about USSR, even though I'm just a (member).
Of course, the more people that stick around, the better. :)