As a Federer fan, I certainly don't mind as he keeps winning and playing at this peak level. He can probably do it for 2 more years, and 20 GS wins is not out of the question. I still want to see him beat Nadal at a French Open final and also take one more crack at another one of those young guns, Del Potro, in an upcoming final, perhaps the US Open once again.
The good news is, the future of men's Tennis is in solid hands. Murray is young and I'm sure he'll win a GS in the near future. If Nadal can get his health issues together, he could also be around for many years. Then you have guys like Djokovic, Del Potro, Cilic, Roddick, Davydenko, lots of quality players who will keep things interesting for years to come.
Meanwhile, we're privilaged to be watching the greatest tennis player of all time during our lifetime, good stuff!