I hope in some ways that Federer leaves the game sooner rather than later. After watching the sometimes appalling grinding style prevail as winning tennis I think it's too much bother, honestly. Federer is not going to go out in a semi or final and play the kind of grueling style he needs to in order to beat Djokovic or Murray, and he knows it. Of course, if he keeps himself in the mix, he's bound to get an opportunity once in a while, but the question is: is it worth it? And with Nadal returning, that would make three guys he's not going to beat most of the time.
Maybe he could play a "full" doubles schedule instead? Or maybe he could really prep himself for Wimbledon, like skip the French Open or something, and make that the focus of his entire year. I don't know.