I wonder if it's like many things, it's hit its peak and is now sliding back down? Was a fascination for awhile, and now like other fads, is fading. I know other forums that appear to be in their "twilight years".
If you do searches, you can find the answers to many questions so new posts not always necessary for discussion. Not that we've seen it all, but the majority here are knowledgeable enough that they don't need to seek or share much advice.
And, as mentioned before, there are other avenues of communications. However, since I don't partake of any of those, I do look forward to what forum members are making and showing on sites like this (don't quit now!).