You can't let one or two upsets command your future predictions. The favourites are favourites because they have better individual players, better tactical training and more experience at the highest levels of competition. Chile beating Spain and Costa Rica beating Italy doesn't change that Argentina and Germany are favoured today.
Not to mention that both Chile and Costa Rica are of higher quality than Iran/Ghana.
Sounds revisionist to me. Before the tournament, even if all of Italy had food poisoning, no one would expect them to lose to Costa Rica.
And no one rated Costa Rica higher than Ghana either.
The point being, the world seems closer in skill than ever before, and while the favorites should still win, anything can happen.