I really believe a large majority of the decline in informative posts is simply due to the time of year. This tends to be a busy time because of holidays and school work. Once spring comes around, it may pick up a bit.
I've noticed that there are several of these types of forum postings, either talking about declining activity or issues with the site. I'll say what I've seen said before: do your contribution to make it better. If everyone who posted a forum talking about issues would post an informative forum as well, we'd be better off.
I, myself, will be able to post starting in a week or so when time provides. I hope some people utilize winter to study and write more as well.