The problem is, are they going to destroy the Republic because they want to stop one man? They tried to do that to Ceasar and they ended up with Octavian.I agree that he will run for president again. I just don't think he will make it. The entire establishment is committed to not let him become president again.
And they are probably right in fearing it. He is a vengeful person, and he will have learned some important lessons from his first term.
The bottom line: The Establishment cannot afford to let him become President again. They will stop him one way or another.