If I were a Phillies fan, I wouldn't be completely confident. You're talking two starters who will be 34 next season (Halladay and Lee), a .500 pitcher over the past two years (Hamels), and a 33 year old (next season) pitcher who's had back problems (Oswalt). On paper, things may look great, but a lot can happen over the course of a season.
But, hey, I'd be pleased if the Yanks had that staff.
I'm hoping that Andy Pettitte will return - even though he'll be 39 next season - just because the Yanks don't have anyone better. Have a feeling that if he does return, he may break down again. If he does return, he should get a decent contract. The Yankees had him over a barrel last year, and he signed a contract for less than he was worth. This year, he holds the cards and the Yankees will have to pay to get him back.
edited for correction: Cliff Lee will be 33 next season.