The leaders of the RNC have clearly stated that the people who vote in the primaries do not choose the candidate, the party leaders do. If the RNC holds a brokered convention and even though the people have rejected him, Jeb Bush will likely get the nomination.
I think that's a possibility. The Bush's run the GOPe and they want Jeb. Period. Would make Jeb's absurd comment about being prepared to lose the primary to win the general election seem far less absurd, wouldn't it?