This time of year until roughly spring time has always seen less traffic. But the slow down overall, regardless of time of year, is much less than the earlier days. Maybe the message board has jumped the shark? People move on, for whatever the reason(s). Look at Will, for example. I am NOT criticizing or judging him at all. Not one bit. But even he has become, at best, an infrequent contributor. This is his baby.
I think we all like waxing nostalgic. Remember the days before the new format when we had chat nights? Or the POTM and themes and prizes. Or even for a couple of years when there was a contest to win a rental house for a week?
The luster has worn off I'm afraid. No one to blame. It just happens.