I don't think he will do it, mainly because of wimbledon. No idea how and why he won in 2011, but I don't think Djokovic is good enough to win wimbledon again. I see Federer, Murray and probably even others like Tsonga and Del Potro better than him. The ranking at the olympics represent my point of view of wimbledon.
"I'm better than most of the guys here in tennis and I'm also smarter than most. This justifies my sometimes cocky behavior." - Maximagq