The Ump Bump wrote a story about their thoughts on Manny's production next year, and his chances of retiring with the Red Sox. It's definitely worth a read if you have the time. If you don't, I'll summarize the important points.
"Under that baggy, pajama-like uni, the man is rock-hard."
Manny getting into great shape this offseason isn't much of a factor, he's always in great shape. His injuries are likley the result of his age, not him being out of shape.
"To me, he’s an easy first-ballot Hall of Famer. If he retires with Boston, they’re sure to retire his number. Is he really going to walk away from that? And is Theo really going to let him? I don’t think so."
Ramirez has two rings with the Red Sox, and finally got through a year without asking to be dealt. He has the most history with the Red Sox and I agree that Epstein won't let a first ballot Hall of Famer walk away. I think Epstein wants to retain both Ramirez and Varitek until they retire. If either player leaves the Red Sox before retiring, Red Sox rules wouldn't allow for their numbers to be retired.
The Ump Bump's story was inspired by one over at MVN. The MVN article discusses the chances of Manny bouncing back next season, and quotes Peter Gammons on the subject. Sound familiar? If it does, that's probably because I used the same quote in an article on the same exact subject less than two weeks ago.