Well Jeb just made that scenario harder, did he not ? Kasich won’t last much longer either ... let’s hope Trump and Cruz make a deal ...that is if Beck and Levin will let Cruz make a deal ..
Trumps best chance is if they all stay in and he hopes he can get 1237 delegates. If Rubio, Kasich, Carson and Bush all drop out the Trump loses to Cruz in a one on one race.
Trump could win if Cruz drops out but we know he has the money and thinks he can outlast and get more votes than Rubio. If Kasich and Carson stick it out to the end would only be for the suspicion of having some influence at the convention, being “power brokers”.
The RNC is screwed if they all dropped except for Cruz and Trump. Then one or the other would have 1237 votes and the party would play hell denying the nomination to a clear winner. No, they want everybody to stay in.