Surely what is good for motor sport in general and for the components of the sport must be the prime motivation of MSNZ (I think there is something along these lines in the MSNZ Constitution). If the Historic and Classic component of the sport can flourish more effectively as a separate sub-group (along the lines of karts, speedway and drags as RacerT suggested) then MSNZ should encourage this as being good for the sport. Trying to control everything just for the sake of it does have the aroma of megalomania.