Actually, I've been saying that the Steelers' lone defensive weaknesses were on the deep the short out passes. I just didn't think New England would be capable of effectively exploiting those weaknesses (I thought the Colts or Chargers would have had better chances).
New England will be able to run the ball much better on Philly than they did Pittsburgh. This will lead to 1-on-1 coverages downfield that Brady should be able to capitalize on, regardless of the quality of the Eagles' secondary.
(So much for my non-progronsticating pledge.)