Well, prepare yourself for a Republican Party that no longer wins, then. Because they are well on their way to third-party status.
Conservatives would love to be in control of the second party in a two-party system. Then Republicans, from their newly discovered third-party status, would be welcome to join us. Whatever.
If you/we do the same work that a third party requires (less actually) within the GOP, there would be no need for a third party.
If we can't do it within the GOP, we darn sure can't do it starting from zero.
The problem ain't the party.