You don't know that. Since his mantra is to make America Great Again, why would he keep steering the ship in the same direction?
He wants to be a successful president in the mold of Ronald Reagan. Why would he stay on course to be the worst president in the mold of Obama?
If Trump gets the nomination he will have a mandate to turn the country around.
That's why I used the word "if" in the sentence you pulled out of context. Words have meaning.