This would work regardless of who controls the GOP, RINOs or otherwise. There seems to be a problem with seemingly good new blood making it Washington only to be consumed by the establishment. Incumbents do not need help from the establishment against primary challengers. The help they get from the establishment keeps them in line and they lose their independence. By the way, there will always be an establishment. It is human nature, just like there will always be cliquish junior high school girls. Who they are may change, but they exhibit the same behavior.
The top tier of the GOP, whether at the county, state of national levels, can stick to refining the platform and focus on winning general elections.
The top tier of the GOP, whether at the county, state or national levels, are Bush League Republicans who are happy to be Assistant Democrats and a fake opposition party.