Not at all. We need to defend as a team at the moment so if you're on the pitch you have a role to play when the opposition has the ball.
And for all his experience - Rooney HAS to stay in position.
If they can both do that (and I see no reason why they can't) then it should be a decent formation.
Rooney has not stayed in his position since he had that zip of pace about him, maybe 3 seasons ago. I think he drifts so much it contributes to us not having any shape or structure