If Trump wins 60% of the remaining delegates then he will win the nomination. If he wins less than 60% than he will not win the nomination. It is really and truly that simple.
No amount of whining and crying about the unfairness of the rest of the candidates not capitulating and handing your candidate the nomination will not change the simple fact that whichever candidate gets a majority of the delegates will win and any candidate that cannot get a majority of delegates will post.
Post = lose.
Damned autocorrect.