YMMB has been quiet since Christmas
I beg to differ, but it's been flat out every time I've been there lately. There are more aircraft there than there has been for at least 10 years with the Grange road and Centre D'nong road parking areas near overflowing. In fact on Sunday I witnessed a twin being told to taxi and vacant the runway as there were 4 aircraft behind ready to depart and the twin hadn't got it's IFR details yet. Haven't seen that in recent times.
GA is certainly NOT dead.