I have a feeling Trump is going to self-destruct, and soon. It's already kind of happening. When he starts fading in the polls, he'll get petulant and pull out of the race citing something along the lines of "Well, apparently the American people aren't ready to make America great again!" or equally whiny.
Which leaves us with... Carson. Who will implode under the weight of his increasingly bizarre serial lies, the newest (and my favorite) being that he has double top-secret intel that the Chinese are operating in Syria.
But hey at least he's not a child molester!
And now comes my totally I-can't-prove-this-in-any-way-whatsoever theory:
Mitt Romney will step in at some point. Because now that the GOP has showered us with crazy for the past year, Mitt's going to look like Harry Truman in comparison and he has the name recognition and he didn't have to go through all of this early stuff, trying to pander to the crazies with whom he never connected anyway.