Here is the political reality: Many Trump voters were pissed at Cruz for events that happened in 2016, and have only begun to tolerate him. All the work he's done to mend that fence went right out the window with the "terrorists" comment, and this time he won't recover from the damage. I hope he's not so self-centered to not realize this situation. He will never be President now.
Is that fair? Nope, but as I said, it's the reality in the ocean in which he swims. Don't shoot, I am only the messenger here.