yea, that would def interfere with the game, it would be a disaster if football was forced to change because of the video review... Bad calls have been a part of the world cup for 80 years... that said, if they can find a way to make a speedy decision (like a 5th ref at the monitor that can say to the main ref: call handball, call offside, call or don't call goal without much deliberation) it may be a good idea that should not delay the game for more than a few seconds...