I really don't know if there could be a substitute for the original forum here. There were many reasons for its success---not even all of what is easy to identify easily. The posters of course were a big reason and also the fact that this was one of the original sites for information type like this. I realize there are many other reasons, but haven't tried to pinpoint them all.
There are also some new boards just starting up.
I try to mention from time to time that we do have a board here: http://exjehovahswitnessforum.yuku.com
Ours is a good site because of the positive nature of it. And we are trying to encourage more jw-related beliefs, teachings, research, and news items as well there for new and old to view.
This is a good time for people to choose the option that's best for them. I would encourage people explore and feel free to do what is best given their own situation whether it's staying here, moving to another site, cutting back on internet time, or posting on more than just one site.