Assuming there will always be the three men in black on the pitch -and it cannot become like water polo- then the requirement not to interrupt the flow of the game puts a limit on video technology. Thus after a false offside flag, you can't bring back the players and say "you stand here, you stand there, you begin your run from here". It's silly. Whenever the controversial situation is followed by dead time it's simple of course. The video ref either changes the initial decision or confirms it. When the video ref makes a real fast suggestion then situations like penalties not given but the ball being still in play, can also be put right. What will really happen is that the ref. listens to the video ref from the studio and we, the spectators, will observe nothing. But refereeing is going to be improved by an overall 80%. The associations are dragging their feet over it. (also radio journalists don't like it because the phone in programs will die and the advertising revenue). Look at this one, from 2011, ruled out as offside: Has become the inspiration of humour artists.