Chen's probably going to need to adjust to the league now that it's had time to adjust to him. His stuff definitely isn't dominant, so he needs to stay one step ahead of the hitters. He'll have to throw less fastballs next season if he wants to be as successful as he was this year. I think he does have the potential to stick around for a while if he makes adjustments. There may have been an element of being gassed, though, what with the long season of pitching every 5th day instead of every 6th.
And here's hoping Wieters can work a miracle with Saunders...