Bush's only hope is he can hang in there until the GOPe/media take out all of the other possibilities. But the way the public is reacting to the Trump pile-on, it doesn't look like that'll happen, either.
The Media need to be careful that they don't become real victims themselves.
The cabal that controls DC and the MSM is in a bind. jebtard! continues to fail, so they keep touting rubio and kasich - just in case, and in doing so split the RINO vote. Essentially suffering a mirror of the problem Conservatives had in 2012 when the Conservative vote was split enabling RINOmney to slide by.
For 2016 the Conservatives were split between Cruz, Walker, Carson, 1% Jindal, and even Randtard. The RINOs split between yeb, Perry, rubio, graham, carly, krispy, pataki...
And then there's Trump, the ten ton RINO-that's-not-a-RINO RINO smasher in the middle of the room.
The Donald is surely not pulling votes from yeb and his unmerry band of CoC establishmentarians. yeb is failing on his own. In some polls the top three spots are all anti-establishment (Trump, Carson and Cruz) . The outsiders represent a total of some 60% of the polls combined.
Even if they eventually tell yeb to quit - which they won't, there's no mathematical way for a rubio or kasich to then fold in all of yeb's former voters in order to garner a majority of primary votes.
The only path to coronation for the RINOs is for the party to radically change the rules, state by state, such that the delegates will be personally appointed by the top RINO in each state and the laws changed in such a way as to read that those same hand picked delegates are not beholden to the outcomes of the primary votes. That is, the GOPe will fix the "election".