You’re exactly right. This kind of talk just fuels the fire.
The only chance of defeating Trump will be to use Alinsky-like tactics: isolate and polarize. The problem is that isolating Trump is like herding cats. He’s already beat the other candidates at the media game. He has the largest megaphone right now.
That's why I say let him have it. Use the money, time and energy to primary every 'pub who supports Boehner or McConnell. That way a President Trump will have a very conservative HOR and US Senate to work with.