I hope I'm wrong, but I think Federer is done being a legitimate slam contender, especially given his level of play of the last 2 weeks. Unless a miracle happens and he finds his form and more importantly, his serve, it will be tough and a respectable achievement for him to only make it to the 2nd week of W/USO this year. This year has 2013 written all over it, maybe even worst. Perhaps he'll turn things around by the end of the year and set himself up for one last decent run in 2017, but at 35+, it will definitely be harder than ever before. Federer's best chance at winning slams were last year, especially after that superb SF against Murray @W and a very convincing USO, yet he managed to go AWOL during both finals.
Djokovic certainly has a chance to break Federer's record. The only thing that could really prevent him from doing so are emerging new players and father time. While I'm not really concerned about the former for now, father time is something he will have to deal with soon. Decade of stats have shown how hard winning a major past 30 is. Another 5 major looks easily attainable based on how he plays now, but 5 majors after 30 is an entirely different beast. I don't think Novak is done winning majors, but the road will become significantly tougher as he ages, just like it's been for other aging legends of the game.
