Djokovic won't get close to another 40+ match streak this year. I don't think it'll be his priority.Plus I can see Murray stepping it up and winning more Masters this year, like Indian Wells and Miami. I expect Djokovic will be wanting to win more slams, where realistically only Federer or Murray can stop him, unless Nadal perfects his more aggressive game.
True. I don't expect him to lose to anyone beside the top three this whole year. Perhaps, towards the end of the waning year, he'd lose to Nishikori.
Realistically, Federer's chances are higher than Murray's and evidently, Nadal's because Novak has to completely readjust his gameplan all the time when playing Roger (at his best).