Like various other historical figures, Trump will fire up the masses to such an extent that the political class can't do anything else but go along with him or lose their jobs in 2018. The tea party types are primed and ready to go. He would be the president- what's to stop him from doing daily 3 hour news conferences where he spews nonsense and vitriol? He has been on TV doing that exact thing. Two years of "trust me, they are stopping me from making you all millionaires" and he could easily turn congress around.
I don't think he can plan that far ahead, but he is certainly capable of stumbling ass-backwards into a scenario like that.