Well, might happen actually in real life, I don't think that soon, but it might somewhere on a close future.
Basically, there are not many new awesome players coming from Brazil. They pretty much rely on a generation with two more world cups to go (Kaka, Ronaldinho, Robinho, etc.).
Brazilian football teams are broken. IFFHS have their league rated far bellow the Argentinean league for example.
I am living in Brazil for a while now, and as you watch their local football games you see they are far behind the average level of European top leagues (EPL, Serie A and BBVA), and even far behind Argentinean and Mexican leagues.
The FIFA agents are all over the country looking for very young talents and they are taking 12/13 years old Brazilian kids to Europe, so they can get them an Euro citizenship when they are 18, and they won't be Brazilians anymore.
I guess it will be like Basketball in the Olympic Summer games where pretty much every top national team had at least one American playing for them. Same thing would probably happen with Brazilians on a short while.
