Lou Dobbs had a recent editorial concerning The GOP establishment and their reasons for wanting to take out Donald Trump. I'm not exactly for Trump, and I'm not exactly against the GOP, but I do agree that establishment Republicans are not more than marginally better than Obama or Hillary Clinton and we cannot condemn ourselves to another Bush 41, or Bob Dole type candidate. It's a recipe for failure, either as a party or a movement, or in the unlikely event of a presidential win, as a country.
The leap from Trump winning the nomination to Hillary becoming a shoe-in as the next president has never been explained. Why is he a sure-fire loser against Hillary? The electorate who would reflexively vote for Hillary includes a number of people who might reconsider, if Trump were the nominee. That's definitely not so for a Jeb Bush or Kasich nomination.