Oh geez, I just realized I've been conflating Reid and Holmgren.
If Reid wins a Super Bowl in Philly, he's in Philly a lot longer. That's just the way it goes. Does he retire or eventually get fired in Philly and go on to do what he has in Kansas City? Who knows. Or is he in Philadelphia long enough that the Eagles jump in front of the Saints?
My point is winning a Super Bowl changes things for a head coach. Do you think he leaves the Eagles when he does if he had won a SuperBowl? I say 100% no