It is still likely that Bush will be the nominee, no matter how well Trump or anyone else does in the primaries. If so then that is the nearly inevitable boneheaded move. He will lose or, if the Democrat nominee suddenly defects to Iran just before the election and Bush becomes the President, it won’t make any difference a all. The Democrat machine still rules.
Bush, or another GOPE candidate, will be the nominee. The GOPe will never allow Trump anywhere near the nomination.