I see him continuing to be an utter t*8t, but on an amateur, rather than professional, basis.
Can I just say that I love you. You saved me from saying something very similar.
No, seriously, I can't see Federer commentating. I think his ego is too big for coaching. Full time charity work doesn't sound like him somehow, and being a full time Dad would probably drive him insane - hopefully.
I suppose he could go on the veterans tour, or bore people to death doing after dinner speeches. Failing that, in the grey outfit and pink laces Wimbledon could offer him a job as a ball-boy.