Well logic would seem to dictate that it's gonna happen one day....just a matter of time...
It already is
ITS CALLED MODERN MX just turn up at your local modern meeting and enter
if your any good as a rider you wont get left behind and all those young hairdressers at modern meetings can go "WOW look at bloke on the old bike go". After all your pre 90 bikes are a much closer relation to todays bikes than they are to proper vintage bikes but the majority of the modern set wont know that