No Cruz will follow the Trump rule that says if you don’t treat me right I am not bound by the pledge. Trump hasn’t treated Cruz right so the pledge has been negated. If Cruz endorses Trump his career becomes meaningless.
What has Trump done to Cruz that isn't "right?"
It might be true of the 8~16 % who still be believe in Cruz, but for the rest of us, we think the following about Cruz:
1) he is a liar
2) he is totally about Cruz
3) he has not principles.
4) He cannot be trusted.
5) he is owned by globalists.