I love that picture because it's a prime example of everything that's wrong with most criticism of the officials. The touch judge is clearly unsighted. The foot on the line is hidden by the tackler's torso and the foot over the line is obscured by the tackler's hip and thigh. If there was another touch judge ahead of the play (ie. with the view that the camera has) then someone would have been sighted and able to make a better call. But there isn't another official, so what's the touch judge to do - call him out on suspicion?
Remember we do have a benefit of the doubt concept in this game. I was under the impression it is supposed to go to the attacking team by territory. Hence why tries are awarded instead of denied when there is some doubt. So if the touch judge is unsighted and doesn't actually see the feet on or over the line and the attacker is in the opponent's half then surely the right call is benefit of the doubt, play on. Doesn't that make the above situation exactly the right call?
Sure, it's rough on the defender but with only four pairs of eyes on the field and the video ref banned from intervening (mostly because of the same whinging from fans), of course there will still be these situations where officials are unsighted and have to make a call purely on benefit of the doubt. This is probably one of the situations that the suggested introduction of four touch judges is intended to address.
http://www.theage.com.au/rugby-league/league-news/double-touch-20091123-iwyy.html