This could be wishful thinking but I'm not sure even two windows will be enough. The rot in that dressing-room runs very deep indeed and the whole squad needs major surgery, but they've p!$$ed so much money up the wall over recent seasons that they may well not have pockets deep enough to get the necessary rebuild done in a couple of windows. The only way they might manage that is to do a fair bit of their shopping in the bargain basement, which is highly unlikely to get them to where they want to be.
Oh dear how sad never mind.
They've got a few big salaries coming off the books this summer and presumably Rashford will be sold.
Will take a bit of time but they have no choice but to double down on a youth movement, take their licks for a couple seasons like Arsenal did, and build back up.
I don't see any short cuts back to the top for them.