I don't know man. We could give him a 2 or 3 year deal at a reasonable level. Given that, I think I could be brought around to the idea of McNabb.
I think I pin the "can't win the big one" tag more on Andy Reid and their style of play than on just McNabb anyway. I think he's definitely better than Campbell. True, 33 is not young, but not over the hill either for a QB. He also knows the WCO and could probably get up to speed quickly.
Your injury concerns are definitely valid and might be the only thing that would scare me off.
You sure you wouldn't give up a 2nd or 3rd for him? I know he's an Eagle but still.....