To start with I have to say that I agree with others in this thread that football is a sport in which mistakes play a part in the drama, and refereeing mistakes are a part of it. However, I think that football absolutely has to introduce the use of modern technology to the game. The real question for me is how to introduce it without effecting the flow of the match whilst still improving the standard of refereeing.
Imo, the reason modern technology needs to be introduced to the game is because there is potentially millions of pounds at stake on the outcome of games. As such, we have to give the referee's every help they can get in making correct decisions on game deciding events, otherwise we should open up a whole new chapter in the game about the responsibility of the referee. ie. The referee is responsible for their own decisions, and is liable for extremely poor decision...
The Man Utd vs. Porto match is a recent example of this. Scholes' disallowed goal would've seen United through (had the score finished 2-1 but I'm not going to debate the nature of time here), but due to poor refereeing United lost out on anything up to £10m. It's going to effect United less than other clubs but what if it was the difference between relegation and safety? Relagation in football's current financial climate could see a team go bust.
Should teams be allowed to sue a referee, or a pro referee's organisation, for loss of earnings due to a bad decision?
Then there's to what extent should we use modern technology in football...
After a match with a controvertial incident involving players (ie. diving, violent play, etc.) we often hear that the FA is waiting for the referee's report before taking action. If they find that the referee hasn't mentioned the incident in the report then no action is taken (unless it's gross violent conduct such as an elbow). Why not expand the disciplinary process to include taking action on incidents which the referee may have missed but is a violation of the rules. I'm not talking about minor infringements but diving could be stamped out.
Diving is a particular source of controversy atm, and it's no wonder with players being able to decide games through an infringement which may be blatent to the tv viewer with their endless replays from different angles, but may be easy to miss for a referee in the middle of the action. I think we have to have a clamp down on this type of infringement and it's not going to come by booking players that dive in the game because we've seen that 9.9 times out of 10 they get away with it. The only way to stop it would be to punish them after the match. A suspension would be in order after a certain amount of infringements. Suspending players for a few matches would be the only way to stop it I feel.
Then we come onto the use of replays during the course of the match. I think it has to be introduced but we have to limit it's use. I quite like the use of replay's in rugby. It's only if the game has stopped that they can use the replays... and not for every decision.
In football, if a goal is scored then there's a natural pause in proceedings. Here the referee can make use of a 4th official to confirm any doubts that they may have over possible infringements. If they have no doubts (even if the player is actually offside in the replay) then they can give a goal and not call upon the 4th official. In other words, it's the referee's decision to ask the 4th official for advice. The same system can be used for making penalty decisions, and sendings off. I don't think that the game will pause for more than 15secs if it's used correctly and the flow of the game will not be effected.