I used to object to Republicans who caved to the Democrats at every turn, and only ran as Republicans by pretending that this time they would not, being called RINOs. Because by the midterm of Obama's second term, that was the majority of Republicans, so they were the Republican Party.
But it turns out that the Party belongs to its voters, not to its "establishment." Republican voters selected Trump. No doubt the establishment Republicans are angry that voters who had stayed home for two or three elections decided to start voting again, now that they had a person willing to stand up for them against the Democrats in the race.
Remember how poorly the establishment types who tried to oppose Trump in the primary did? I can't remember: did any of them ever go above single digits?
So now the RINO's are the never-Trumpers, like Cheney, and the compromisers willing to once again go along and give lip service to the Dems. None of them have even tried to oppose Trump this election year, and I don't know of any of them floating the idea of primary-ing him.