Instant replay really does need to be added. I've not supported it in the past because one of things I like about the game is the smooth, mostly uninterrupted play. In American football they have instant replay reviews that can go on for minutes while the refs try to make a decision.
But after this world cup I think everyone can see that the benefits of instant replay would outdo any setbacks. After that the only other thing they need to fix is the players diving, it really is just bad sportsmanship at it's worst.
^lol