Nixon's Southern Strategy in 1968, the formula for every Republican success since then, pretty much sums up my response to that. I always registered as Independent until 2008, when I decided I wanted a say in the Democratic nomination (though, I do not wax nostalgic for the Nevada caucus system). Then last year when we moved to another state, the DMV offered to register me to vote, and I picked Republican, figuring that would be the far more interesting primary to take part in (so, my prognostication powers proved lacking). Point being, there is still plenty of room for monkey business even if you limit primaries to those registered to one party.