A distinct sub-culture, and a unofficial cadre of leadership, has already formed around it.
I think there will be a split, but it will be as a result of the sport taking on its own identity, rather than as a result of the traditional surfcasting community rejecting the wetsuiters. In other words, I don't see a surfcasting "purist" movement arising.
It will happen organically. Somebody will write a skishing book, a skishing-specific website will form, skishing tournaments will arise, etc.
Its a very effective method of fishing and the people participating are usually very good fishermen and they definitely have balls.
Maybe Paul Melnyk will revive his site and organize some of his rants into a book after that .