Why does Federer even need a Singles Olympic Gold? He has nothing to prove on the surfaces he has played Olympic Tennis on. Let's examine each edition he participated in.
2000 - Rebound Ace
He was way pre-prime in 2000, but he was 4th that year at the Olympics. It was played on Rebound Ace, on which he has 3 Australian Open Titles. And Australian Open >>> Tennis Singles Olympic Gold. Why does a guy that has 3 Slams on Rebound Ace need to win a 750-event on Rebound Ace? What would it prove? It's like saying a guy with 3 French Open Titles needs to win Monte Carlo to prove something. It makes no sense.
2004 - DecoTurf
He should've won this one, but it was played on DecoTurf, on which Federer won a Slam the same year at US Open and 4 other times. And US Open >>> Tennis Singles Olympic Gold. Why does a guy that has 5 Slams on DecoTurf need to win a 750-event on DecoTurf? What would it prove? It's like saying a guy with 5 French Open Titles needs to win Rome to prove something. It makes no sense.
2008 - DecoTurf
He should've won this one, but it was played on DecoTurf, on which Federer won a Slam the same year at US Open and 4 other times. And US Open >>> Tennis Singles Olympic Gold. Why does a guy that has 5 Slams on DecoTurf need to win a 750-event on DecoTurf? What would it prove? It's like saying a guy with 5 French Open Titles needs to win Madrid to prove something. It makes no sense.
2012 - Wimbledon Grass
He could've won this one, finished runners-up and got the Silver, but it was played at Wimbledon, where Federer won a Slam a few weeks ago and 6 other times. And Wimbledon >>> Tennis Singles Olympic Gold. Why does a guy that has 7 Slams at Wimbledon need to win a 750-event at the same place? What would it prove? It's like saying a guy with 7 French Open Titles needs to win Hamburg to prove something. It makes no sense.
So, all in all, Federer doesn't need the Singles Olympic Gold. His having one wouldn't prove anything. He already has its equal, in terms of worldwide prestige and recognition, in his Doubles Gold. His Singles Silver serves as icing. Thanks for playing, haters