Why can't Federer win in major?

No need to be pessimistic,really.He is still playing fantastic tennis and winning titles.Unfortunately for him he can't seem to win Slams,but that will change as well.I think he will win Wimbledon and the US Open.Annacon has really changed his game and raised it on another level.He has been playing amazing tennis since Wimbledon.He should continue playing like he did in the last 7 months and he wont have any competition...