No, if it gets 'too big', that means those holding the other viewpoint have taken charge. And pretty soon they'll show you the door. That was done to Dem conservatives from the 70s on, until the south is solidly Republican, when it had been solidly Dem from tradition, and the war. So far, the GOP 'clubbercrats' have reluctantly, on the one hand, tolerated the grass-roots conservatives and evangelicals. On the other, the keep try to show them the door. And if conservatives are split off by such machinations by the 'old party hacks' and the cynical pols and contributors then there is really no history of a successful third party. If that happens, the Dem always win. And this country won't be worth . . . well.
There seems to be far too many 'professionals' in the GOP who can't stand the memory of Ronald Reagan. Reagan OUGHT TO BE their example. They ought to say his name with respect, not as a barely muttered curse. And they ought to study his method and his beliefs, because I think it's very clear that Republican Party would win, all the time - and ought to, in America.