I first mentioned this last year that Djokovic could be the player to surpass Nadal and Federer in Grand Slam titles won and right now my prediction is looking very good. If Nadal doesn't win the French Open this year then yes I believe Djokovic can match Nadal's 17 GS titles this year as if Djokovic can stay fit and healthy then he will be hard to beat at Wimbledon and the US Open. He may even win the French Open with the form he is in right now.
@Kemarit and I have been saying this for a while now about Djokovic as his form in the back end of last season looked like the Djokovic of old. He now becomes the outright Australia Open winner on 7 titles and also surpasses Pete Sampras on the all time GS winners. We are all very lucky to see the top 3 players all of time play at the same time and I'm not sure if we'll see this again.