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Talk Tennis Guru
Why would Djokovic think that the Fed 16 is impossible to break? From our outside perspective, it may look that way, but I feel that Djokovic has an insane amount of belief in himself, judging by the way he approaches his matches. He may be just crazy enough to think he'll get 11 more majors...
(and there'd be a small but non-zero chance he'd be right!)
Djokovic has stated in an interview that he would be happy to retire with Borg's number of slams--i.e. 11. I don't think Djokovic thinks that 16 slams is even achievable for him. He is already 24 and will be 25 in May.