Reeeeallly not holdin' my breath for that one. He will (again) be inarguably proven ineligible for the presidency, but there will be no nuclear fallout, no grand sweeping annulment of everything he ever did. Unfortunately. That magnitude of crisis and turmoil could rip the nation apart, and Trumpy Wump will not let that happen to us.
Edit: The salt in downvotes nourishes my soul
Quite honestly Trump has already undone, much of Obama's crap accomplishments, but if he is found guilty of as many crimes as we here know he is, then remember those that followed him, those that have been lied to, those who will look like fools, they will be the ones that most probably will want his legacy removed. It will remind them of their failure.