Good. It does several positive things, it keeps away the running storyline of if he is signing a contract for next year, it allows the Yankees to make plans for the future, it allows Jeter to get a love fest like Mo did (although not quite as guady I hope) and it gives him a chance to retire while still having some skills, avoiding the chance of Jeter playing somewhere else as a part time player a la Knoblauch on the Royals.
I'm surprised he announced it Mariano style... I thought he'd do it at the end of a season, quietly, with no fanfare.
Better this way, media won't have to ask him after every game if he's gonna retire. And I remember durring 3k hunt I believe his parents in an interview said they wanted him to step back and take it in. I'm sure they told him to do the same here. After all he's done for this team, he deserves this send off.