This talk about not leaving is so silly, just stupid fear mongering. If you're old enough, people said the same thing about Clinton. There were conspiracies about Hillary running after him, with him as VP, and when she won, she would resign a day later for him to finish her term, because technically you can't serve more than two consecutive terms.
For all the hand wringing about what Trump's loyalty from Republicans means about the Republican party, it's really, very very simple. They're getting more out of him that a traditional Republican likes than things that they don't, and that they'd get from the alternative.
Republicans have been quite outspoken about disagreeing with him on foreign policy moves and trade and many of his worst statements. But they aren't about to throw a guy over that delivers them 78% of what they like in favor of a Democrat that delivers 0%.
And all the handwringing about Trump ending the Republic, of assuming dictatorial powers, etc...most Republicans see that for what it is, social media nonsense.