J.C.
I don't think you will see it taking over any more then it already has because it is not new, it has been around and popular for almost a decade now. I think it will end up kind of like jazzercise, for a while jazzercise gyms were everywhere, now there are just a few. Right now crossfit gyms are everywhere and with time there will more then likely just be a few. Same with the crossfit competitions, remember back in the 80s when they had aerobics competitions and it was all the rage? lol, I think I might have just dated myself :)