Considering how pissed the establishment Republicans are that he might be the nominee, they're all betting on an open convention followed by some combination of a Walker, Cruz, Rubio, Ryan ticket.
I can't believe how people have lost their minds and he most likely won't get the amount of delegates required to get the nomination outright before the convention in June. Clearly whatever he's doing, he's struck a HUGE nerve somewhere, because there is a fuck ton of panic in the streets and it's still very, very, very early in the process.