He might, I think he will be good for a very very long time. Even when he slows down he can move to a trequartista position. He is such a good playmaker. He just needs his teammates to not drag him down. Higuain should never be played over Tevez ... even based on work rate alone Tevez is worth having in the team and his finishing is better.
If they don't win it next time, I really don't think it will be because either one of those four teams. Germany I can see being an obstacle again, as I can see other South American teams who have that grinta play style. But Brazil has nothing going for them, neither does Italy, France is overrated, and Belgium is Belgium.
Argentina always struggle, always did since i can remember. Goes to show that having an amazing set of individuals mean shit if you don't win anything, unless you're Brazil 82', of course.