I think you have this all wrong.
Nobody is going to ALLOW Trump to leave office. Because he's not leaving.
He won this election and he will be retaining his seat in the Oval Office.
Bank on it.
President Trump did win.
There was massive election fraud. This fraud is patently obvious and most of the people denying it are lying to themselves and everyone else. Trump is doing everything in his power to correct this. However, the Democrats, the states, the Media and even the GOP are doing everything in their power to thwart him.
I am old and Lucy has yanked the football away too many times for be to believe that THIS TIME Charlie Brown will be able to kick it.
Even if President Trump (and he is the only individual I can think of of who could do this!) pulls it out, he will have to march his legions across the Rubicon effectively ending the Republic.
If President Trump leaves office, the Democrats will never stop hounding him and his family.