I think something definately has to change after this WC regarding refereeing.. I think that one 'challenge' per team would be a good idea, BUT, there are tons of cons... For example, ball hits someone suposedly in the hand, referee says it's ok, the other team goes in counter attack (fast one, like Germans did today), and then the coach asks for 'challenge' cause of that hand play. Now, you have to stop the game, and, stop that counter attack and probably a goal.. You just can't do that, it would kill football as we know it. Let's say they got it wrong, referee was right, and there was no hand play, who will give that counter attack back to the other team? I just don't see how this could be handled, but something has to be done imo..