Of course not, because any scenario where Cruz beats Trump is on the second or third ballot at the convention where the winner of the popular vote (by a pretty substantial margin) is being robbed of the nomination. That's not the point. I'm not saying whether Cruz should or shouldn't. I'm saying Cruz is a spineless worm and will back Trump in the fall because that's just who he is.
He hitched his wagon to the Trump train when the campaign began and now he's flip flopped because he can't really do that when the field is narrowed.
Cruz prob will back Trump. Ive never felt it was all that personal between the two more of a competitive thing. If Trump fails in Nov and Hillary has a awful 4 years Cruz would by default get all of the Trump voters in 2020. If he doesn't and stays nevertrump then he will get a quick exit 2020 primaries.