I wonder about this too. Especially following a long career, suddenly becoming "yesterday's news" after all the hard work must be a difficult sensation.
People remember your name, but they're ultimately interested in the guys still on the field. If you don't have enough other interests to keep you busy, I have no doubt this could be the source of depression.
Thanks, Pooj.
And don't worry about the Captain. He'll always be Hamdan's Revenge to us, anyway.