This is a scenario that often happens but I can't see it panning out here. Man Utd are still one of the biggest clubs in the world plus any new manager wouldn't have to do much to improve on the previous incumbent's effort. This being the end of the season rather than the middle makes it less...
Or double carpet w/ b365 if you prefer. The "caretaker manager to be the permanent manager" is an angle I like and one which has been profitable for me in the past - but I won't be playing on this occasion. GL if you do.