Was going through the cricinfo commentary. It appears that Young's decision was a wrong one. Had he used the DRS, NZ would have been 4-0. Now this is where I feel the whole point of having a DRS is defeated. A player is reluctant to use it for fear of losing it. Therefore, instead of having a limited number of reviews to use, I feel there should be another system in place. Something like - dock x runs from the batting team/add x runs to the opposition team's total in case you lose a review.
In the end a wrong decision was made and there's evidence to back that claim. In such cases, wouldn't it make sense to have the 3rd Umpire overrule the onfield decision (at least have this option if DRS reviews continue to be limited in nature)?