What I mean is that after a while even they will not be able to keep the sham up.
My guess is that Honda (or possibly all of the Big 4) will lose so much money in motocross that they just roll-up and go home. Then the chance for a displacement rule change following the Amateur classes will gain some "traction."
As for vintage racing, I tried it and I prefer the newer machines. Of course that is just my opinion.
Don't they have gates at the AHRMA events?
As for the AHRMA stuff that JETZcorp speaks about, it's prevalent on the east coast as well. There was some serious political battles and the AHRMA guys lost big time. At one event they promised the promoter 300+ riders and only 40 some odd showed up.
The guys that used to ride those pre-1974 bikes are for the most part getting older and the bikes and parts had gone out of this world (well before the economy went into free fall) It just makes sense to provide classes for the bikes that folks can buy.
Besides depending on how old you are you idea of "vintage" can be wildly different. For some that would be a 1960's Triumph and for others it would be a 1984 KX 80.
Of course I think the bike below would qualify as vintage by any standards!
1935 Scott 498cc two-stroke