At some point, you have to build for the future. Realistically, there are only 14 players who can play in a game at a time. This means that only a handful of players will see playing time. Why not take 1-2 young players for experience sake, like Brazil did with Ronaldo.
The US took an experienced #3 GKer in Tony Meola to Korea/Japan with the excuse of "what happens if"... instead of taking old players to fill the end of your bench, why not start to build World Cup experience in young players?