I am just a normal person, in a not-so-normal world. (I had nothing to say)
In my opinion, I think it is just because the forums are cooling down, meaning that some people who may have wanted to be on the forums while it was huge finally get their chance to have their word acknowledged, whether it be unfunny, serious, or somewhere in between. The forums are a tightly-knit space, you will recognize a face and see it over and over, and it will keep dwindling until there is the minimal foundation of us and only us who are bringing the forums together. We are the ones making the forums what it is, and the only reason people may want to join is because they want to join a community of like-minded people who enjoy a game or want to talk about something. Of course, my thoughts may be really outdated, since I haven't been part of the forum in many, many, many years.