I've often thought DRS review system to be a bit strange. We saw it today in the ashes: the Aussies wasted their 2 reviews on correct decisions and were unable to do anything about several possible shouts later on in the innings, much to the delight of the Barmy Army! It's obviously unfair if a batsman is dismissed merely because the umpire made a critical error and made an incorrect call, just like in football when it is infuriating to see a goal be disallowed when it transpires on the replay that it was in fact a goal, but I also get that it would get tiresome if reviews were unlimited for the players but my question is this: why allow reviews into the hands of the players?
Surely, all of the technology that we have, such as hawk-eye and snicko, are able to log all of the crucial info pretty much instantaneously as the delivery is being made in real time? Even when the umpire says not out and no review is made, the television coverage will frequently show the viewers the likes of hawk-eye and the commentators will usually say 'great decision from x umpire' or occasionally, 'Oh dear, that was out: x has been very lucky there. Poor decision from the umpire.' It doesn't take them ages to get that confirmation: surely, it would not take the length of time between one delivery and the next? Therefore, why not have a third umpire meticulously watching everything on their screens and give them the power to intervene and overrule the umpire, if and only if, he has seen that an incorrect call has been made. The footage would then be transmitted to the fans back home and also to both the players and umpires on the field and the fans in the ground via the big screens. In other words, nobody ever gets away with staying on the field when they should be out, and vice versa: plus, players will be unable to continually disrupt play with a barrage of reviews and we will never have a scenario where a batsman cannot be given out by a review, even if the review would have been justified, because the fielding team is out of reviews. What is the problem with that?