Yes, this does place pressure on a ref - the same pressure as if he made the decision the moment it happened.
The referee deals with criticism no matter what he does during a game, so this is no different, but what this does eliminate is the sceptical value of having video replays when those replays cannot provide the evidence to categorically give a yes/no answer.
Games at this stage of the year are vital and teams and fans want to win based on the merits of themselves and the referee, but people will accept from the referee a call that is down to human instinct rather than an electrical device that cannot serve its purpose.
The use of the video replay system has changed the complexion of the game and I am not convinced it has been for the better. There are decisions made on the speed of the camera, which is vital in some incidents. For example, if a player or the ball is deemed out of play, the slow-motion camera determines if one or the other is out in 99.9 per cent of cases. The action of a try being scored when that player has lost control of the ball is conjecture; the slow-motion replay shows a finger in contact with the ball in contact with a blade of grass and this is deemed to be a try. But if you view it at normal speed, he has lost control of the ball and no try is awarded.
There is too much debate now on this evidence. We need to review use of the video or we will continue to be frustrated fans.