Any possibility of one of his former players taking the reigns? Neville or Ole. Someone like that possibly?
Moyes would be ideal though. He'd probably take Fellaini to OT and impose a horribly dull style of football.
Whoever it is though, they'll be a bedding in period. A chance for City/Chelsea to storm ahead and assert their dominance. They next two or three years will go a long way in shaping much of the future. If United continue winning then not much will change but if City/Chelsea can win two or three in quick succession the pendulum would have well and truly shifted.