The candidate who receives over 50% of the delegates wins. Those are the rules. Period. If Trump earns those, I will be disappointed, but I won’t “destroy” anything.
If Trump is just short 50 or 60 delegates, it will be the voters that destroy the party. Polls show even people voting for Cruz believe whoever wins the popular vote and has the most delegates should win. Only the sociopathic Cruzers think otherwise, because they are basically Totalitarian SJWs.