In basic im against it... As you all say.. it could be a 3hours match then..
But on the other hand.. With a prober set of rules, this could be useful..
In NFL the manager has the option to demand the play to be looked through. BUT not all plays are allowed to look through..
Following could be allowed..
Liverpool goal against Chelsea in Champions League by garcia.. The ref says its a goal.. So game has been stopped at that point.. Is it to much trouble for him to run to sideline for 1min and look it through?? Or have a 4th ref looking it through backstage some where?? And again.. In NFL, there has to be CLEAR EVIDENCE, that the ref made the wrong call.. If there isnt that.. Then the first deceision stands.. So as i remember it... Garcia goals stands, since there is no video evidence showing that the ball was not 100% in....
Could be used in Manchester United vs Tottenham game 1-2years ago... Keeper has the ball.. Closest player is on the other half. (well almost

) Why not take a 1min break..
Cant remember when this game was played... But if it was a year that spurs just missed champions league qualification by a few points.... Then it was a very expensive mistake...
Liverpool vs Bolton.. Free kick awarded to bolton, because reina touch the ball outside the penalty box... Why not take a min to look that through, and admit that an error was done, instead of giving away a good chance..
That was just a few of the games, i just remembered... And there is problably a lot more i dont even know of..
But could mean a lot of money in the end for one club or another because a ref or linesman is drunk in play...
Liverpool is very poor atm.. (SHUT UP MUZE)

I doubt at the moment what liverpool will archieve this season.. Will they miss 4th spot...
Will it be by 1-2points, that might have been won against bolton...
There is a lot of if and if and if and if and if..... But we will always look back at the poor refs games, and not the games where the team was bad..