It is kinda a Mexican standoff. (Can we still say that?)Are we to believe that if it goes to the convention, they will give the nomination to anyone but the leader in delegates?
The numbers don't give anyone the clear victory, so a negotiated resolution must be had. Trump is so polarizing, and would be so clearly rejected by late-primaries if he doesn't win outright, that he would be pretty toxic.
Cruz might also be counted out, for similar reasons.
I think that's why people expect Rubio to come away with a brokered nomination. Or a dark horse candidate like (God forbid) Romney.