Cards offense overrated?

Cardinal offense literally runs through Larry Fitzgerald. When Fitzgerald does not have any catches, the whole offense suffers. I mean just look at Eagles vs Cards game during the third quarter. So it would seem logical that Steelers will single out Fitzgerald and double team him on every play. Now if Fitzgerald is out of the picture, its going to be a long day for the Kurt Warner. Just food for thought for all you band wagon Cardinal fans.