If the Miata had never been produced, would SCCA have died? Hell no! People that want to race would race something else. The Miata is the easy button, a ton of development has been done on the car by Flatout, Planet Miata, Kessler, et al. Buy a Miata, rent a Miata...easy. But we sure as he'll don't need more classes for them to run in! Or cater to their every whim.