I was really big on Hairston as well, and I still have hope that he can return and contribute. That being said, we can't go into next season relying on Hairston.
I know the Hairston topic has been covered before, but Hairston disappearing from the face of the earth over an injury that nobody seems to have a clue about is a disconcerting.
Thankfully Hairston recently said on twitter that he was a full-go for spring workouts. So we'll see what happens.