When are people going to realize that this is a blessing. To be able to sit in front of a computer and share or see what everyone else is doing, don't you guys think that is fun? Who cares if someone comes in and tries to stir trouble or say what's in his mind? Don't like it? Ignore it, it's that easy, there are hundreds of other threads that are much more interesting than others.
I remember when we didn't have forums a few years back, I was always desperate for the next model car magazine to hit the stands so that I could be up to date with what was happening in our hobby. Nowadays, not only do I still purchase the magazines but if I happen to miss an issue, well, I have the forums, isn't that the greatest thing?
Probably some people have decided to leave the forum, others might have lost interest and there are probably hundreds of other reasons for people quiting but I look at it this way, it's their loss. When all is said and done, when you are really passionate about this hobby, you will end up in a new place with totally new issues.