I dont think it is has. You have to realize that they did this with the first killzone as well. they left it alone and left us alone as well. They are still reading, they probably just dont have time to post anything.
There is usually a lull or whatever between games (from a communication standpoint), but my concern is the community, expecially the one on these forums. The forum change seemed to deter a high percentag of people from posting here. That's a guess, but it's the only one I have. I think people still have trouble navigating and posting here.
Even between games, this place used to be hopping. I swear that as soon as the forum changed format, the traffic here came to a screeching halt. I'm sure that when news of the next KZ installment starts rolling in we'll see traffic increase, but it will likely be a lot of new users and not as much as the old guard.
I don't know. Maybe I'm overthinking it.