Every US president in history has left office peacefully, the most probable outcome is that future presidents will too.
Similarly, some people always think that the current president will crown himself a king and the Other Party will never ever be able to get into power. And these people have been so far always wrong.
I’m not saying it can’t happen this time, but in my opinion, it is unlikely.
The real skeptical in me says it doesn’t even matter, no matter who you vote for, you’ll get John McCain.