Yep, Football, and Nascar both at one point were run by the participants, however somewhere along the line, someone came along and took it to the next level, and both have more spectators than BMX, and more corportate sponsorship, hence more money for growth, than BMX. And if you look at little league football who runs that? Not the players, but parents.
My point is that, if it is just fun to go to the local track, the local scene will grow, and the rest will take care of itself. I think one day someone will come along who will figure out the formula the will expand the sport, just as in football and nascar