If Bale could find his prem form, and Depay settles very quickly, this would be some team:
Depay - Rooney - Bale
Di Maria - Herrera
Carrick
It would require some extra defensive work from Herrera, but what it could do while attacking would be something else, although I'd say counter attack would suit that set up more than the heavily possession based tactics.
I would feel slightly sorry of Fellaini being dropped from the team, but honestly, is in there for his height, and for an option to cross into the box, or aim for as a more direct route. The thing is, Bale and Depay bring goals, whereas young and Mata fetch a more creative side to the attack, so the height that Fellaini would bring would not be as needed as it has shown lately