It's a completely retarded article.
Are Man United good enough to win the league without Rooney? is not the question at all. That implies that if the answer to that is no, Rooney should play.
The real question is: Is Rooney better than the other options?
6: Herrera, Carrick, Pogba, Schneiderlin
8: Pogba, Herrera, Schneiderlin, Fellaini
10: Mata, Pogba, Mkhitaryan, Rooney
9: Zlatan, Rashford, Martial, Rooney
Wide: Martial, Rashford, Mkhitaryan, Lingard
At best he's our 4th choice 10 or 9. In every other position we have 4 players that should play ahead of him.
That's 11 players to choose ahead of him for 6 positions. There is so many combinations of players to try before Rooney comes into the equation not to mention the fact that any combination that we do try should be given a proper run before it is discarded as "not working".