At this point, my ideal scenario is that Trump wins ST by such a convincing margin that the rest of the candidates are convinced they have no hope of a brokered convention. That leaves them with a choice: one or none. They cut a deal to consolidate or all certainly lose.
Right now Cruz has the strongest argument by far to remain in the race. If he folds, much of his support will go to Trump, helping no one. If everyone else folds, the vast majority of their support will flow to Cruz.