Holidays have people pre-occupied with other things, especially when they visiting with family they haven't seen in a long time.
Another reason may be simply, the Winter Blahs! Nothing is happening, nothing to write or ask about, as more than 1/2 the country is bedded down for the Winter.
Another reason (and this is a guess), there's been a lot of "negativity" on these forums lately and I think folks are somewhat reluctant to post for fear of back-lash by other posters.
But mostly, I think it's just "that" time of year!