Sean Ingle explains why referees need help, technology is certainly not the barrier. I very much agree with him, especially when he says "decisions may even out over a season, but they rarely do so over the course of a match." I really do not understand what's keeping the FIFA from making it a fair and better World Cup.
"Clearly there's a balance to be struck between maintaining the flow of the game and making the right decision but if other sports can do it, so can football. Ultimately, it boils down to what is preferable: a 30-second delay in play, or the Hand of God? Getting it right, or allowing cheats to get away with it? Certainty, or random chance?"