I think that bridge has been burned.
I don't think so. These are men who are high achievement, and long term strategists. They play the game, get the others to out themselves, and they come in and mop the floor with them.
My inclination is that Trump needs a pit-bull on Capitol Hill who will arm-twist to get what he wants through congress. This thing between Trump and Cruz has tag-team written all over it.
As nasty as the exchanges have been, it is true that iron sharpens iron.