Sure, video evidence would slow the game down slightly, but not as much as the luddites would have you believe. The ball is only in play for 60-odd minutes anyway and double-checking, say, a goal-line clearance, penalty or offside appeal would add seconds not minutes. If there were any doubts at all about the TV replays, the referee's original decision would stand.
Introducing technology would also change the risk v reward debate that zips around a player's head: there'd be no incentive to dive for a penalty when someone in the stands could alert the referee, who would soon be waving yellow in your direction. And why pretend to be punched, when in 30 seconds' time you'd be receiving red for play-acting?
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?
Guardian.uk (thanks, dad!)