It's common knowledge of course that Cruz is very unpopular with his colleagues in the Senate and the establishment as a whole. Yet this same establishment came to support him as Cruz became the only viable "neverTrump" vessel.
Cruz, if he remains in, is doing serious damage to his career as a politician. His stance that a convention win against the will of the people doesn't sit well to a vast percentage of the Republican voters. Couple that with the crowing about landslide wins in voter-less elections and you have a seriously diminished candidate.
So my theory is that the establishment who started out as "neverTrump" are starting to see the inevitable in that Trump is going to be the nominee. This same establishment is now pushing Cruz to alienate himself from a large segment of voters and therefore damage himself so fully that he will not get reelected in his Senate race.
They may have been forced to accept Trump, but they will have gotten rid of Cruz.
They may have been forced to accept Trump, but they will have gotten rid of Cruz.
That is a very interesting theory. We should see if it pans out in the next few months or so.