Derek Jeter just announced that he will be retiring after the 2014 season. I wish so much that Marty had the foresight to do this before this season started. I know his reasoning was that he didn't want it to be a distraction and he wanted to see how he'd feel when the season was over, but I think it would have been so much easier for everyone involved if that had been the case.
I know it doesn't really offer anything because reality is what it is. It's just the first thing that came to mind when I read that announcement.
I always feel like those announcements mean the guy just wants to travel around having his ass kissed like Rivera did last year. Just announce you are retiring when you are done. It doesn't make anything easier, even if Marty announced it (and we don't actually know if that is even his intention), you know he would have still wanted to play every day and it really wouldn't be any different than it is now.