He's been insane for a long time, so if you mean will his sanity last, of course not.
Physically, yeah probably.
But anything can happen.
IF it comes to pass that the polls are so devastating that it points to a blow out landslide for the democrats for the presidency, house, and senate and he feels there is zero chance to win or be close, then I think he might try to flee the country to dodge prison.
If he thinks it will be close (which is probably still the most likely result) he'll stay and try to incite a civil war to take power if he loses narrowly.