Djokovic played a great final and Federer couldn't reach the performance level he had against Murray. Way too many errors with the backhand plus his serve left him in the important moments. Djokovic is a deserved winner, that was probably Federer's last chance for a GS title. It is still incredible how a 34-year-old Federer can dominate Murray like that in a semi-final and then almost match the undisputed number 1 of world tennis in his absolute prime in the final. Unfortunately that only happens at Wimbledon. From a Swiss perspective: at least Hingis won two titles.
About Djoker winning 14+ Grand Slams: I can see him reaching 14, but not many more. He is favourite for the US Open and maybe also for the Australian Open, but there are a lot of younger players ready to push on. Nishikori, once injury-free, will be tough to beat on hard court, Murray will probably also have a career year soon and players like Kyrgios, Cilic and Raonic have showed they have more in them. My prediction is that he will finish on 13 Grand Slams.