They've got the basis of a decent side:
_________De Gea
Rafael Smalling Jones _____
________Fellaini
Januzaj _______Mata
_______Rooney
______Van Persie
Van Persie was a massive factor in why they won the league last year but he's possibly gone into sulk mode about Moyes pushing him too hard and playing him when he wasn't quite ready to return. And for some reason RvP's relationship with Rooney seems to have deteriorated and now they hardly pass to each other.
The positive spin on that is that Rooney could play in his preferred position up top, which allows Mata to play in his preferred position behind the striker and then either Kagawa or a winger can come into the side.
Fellaini was never what they needed. Moyes is afraid to play him up front in case he's accused of turning United into a route one side and he doesn't have the engine, the pace or the reading of the game to cover in front of the defence. Neither does he have Gerrard's passing range and vision to play like a quarterback. A more progressive manager might think of converting him to a centreback and flanking him with Smalling and Jones.
Davey has mentioned in the past that he wanted to coach in Germany at some point. Maybe he'll do what McLaren did and rebuild his reputation abroad before coming back and taking over someone like Celtic or Newcastle?