President Trump
I am going to make a prediction–a possibility not a certainty. The sybaritic businessman will quickly find that he is (a) not up to the job of president and (b) he doesn’t like the job. He doesn’t have the knowledge or the patience or the skills to do it adequately, and he chafes at the constraints imposed on him by security and scheduling. He’d like to give it up and go back to his old life (so would his wife), so he hands the reins over to some establishment Republicans and retreats into being a dummy president. Then it’s business as usual–by no means good but maybe not catastrophic. Alternatively, his unsuitability reveals itself very early on and the world comes to an end.