First of all new players are the most likely to be standing still and thus the majority of the victims. I believe it will help new player retention because a one-shot death feels very unfair. Two-shot reduces the feeling of injustice of the event because they won't be able to use the words "without warning" (their head turned very red).
Secondly it has a new player training aspect. The very red head may immediately change their behavior and they will try to self-preserve.
Thirdly, it *might* cause more mixed loadouts on snipers. They could mount an ERLL or small LRM/SRM and fire it concurrently to try and finish their kill with a little before or after damage. Either way they are extending their variety of loadout which is a good thing.
Edited by ElLocoMarko, 26 March 2013 - 08:00 AM.