I really do not see the local club tracks around the great lakes area switching over to wka gold cup classes. I wish they would because in fact there kart entry numbers would grow overtime I believe. So in the mean time a WKA divisional 4 cycle sprint series look more attractive to me than waiting for local tracks to come around. Ravena is for sure a track that has there own unique engine rules that do not even follow any other series or organization in the US!
Personally I would like to get all the 4cycle sprint track owners / promoters in a room at one time and work out a program where all of them would adopt all the exact same classes. That would be better for all parties involved.