No they won't. He was in once and then gone. But he came back and so much worse. He has demonstrated that not only is there enough appetite among the voting populace for his brand of hate and violence, but that our institutions are woefully incapable of protecting their own country let alone the fucking world. Prior to that I'm sure most of the world would have thought straight up kidnapping a "democratically" elected world leader and a full on unprovoked war (in all but name) would be impossible. But here we are. Anything short of an actual uprising or revolution won't be sufficient on their own. I'd bet good money we don't have a chance at seeing a return to the position and soft power we held for at least half a century.

The Orange one has demonstrated how useless the system is at dealing with him. It doesn't matter what the next guy says, everyone has seen that the guy after that can just blatantly ignore the rules again, tear up and ignore agreements, and nothing will stop him.

That's the real problem. The promises and signed agreements of America mean nothing now. I don't know how you fix that without some serious structural changes and some way of proving those changes will be actually enforced.