For the regional and club level, yes, I think that is a very definite risk. Now, I don’t run at the national level. However, I’ve been around long enough to see that a national program, if it offers a good schedule, interesting locations, and halfway decent customer service, the drivers will run just about whatever formula is given to them as long as it’s not junk.
As far as it pertains to the regional or club level, here are my two cents. Even when you have an incentive to move from an old class that may be on its way out to a new class that has strong potential, there is almost certainly a small number of karters that you might lose altogether from the sport. The hope is is that newcomers will fill in the gap. I know that some will say that you should simply offer the new class and the market will determine which class will survive and which one will fade into obscurity. That doesn’t happen too often and karting though. What usually happens is that you have two classes that have significantly smaller fields that one, singular class would have. The result then is the common complaint that there are too many classes, but no one wants to be the person to give up his or her class for the sake of the sport.