When we closed the member groups forum there were only 2 active threads in that forum. The idea was good at first, and got a few good threads/groups going there. But in the end it died and the forum was only there for just 2 threads so we put all the threads in their respective group forums and got rid of the member group forum.
And just incase someone asks this question... no I don't think it'll be coming back anytime soon (not with how inactive it got), just about everything in that forum can be done in Other Clubs.