A masterpiece. The philosophical pondering of morality and the price of progression in order to achieve justice to deliver "peace" have never quite been as eloquently displayed as they have in this here series.
Even without a second season the message of Psycho Pass was a very poignant one. What's the price of justice and what do we have to sacrifice (Akane staying subservient yet morally reluctant towards the Sibyl System and Kogami becoming the immovable object to Makishimas unstoppable force)
Beautiful, introspective and most of all powerful.
As for the ending:
As for their being a second season I would guess that all depends on how well the DVD/Blu Ray ends up selling in Japan and overseas (mainly Japan). I'm perfectly fine with this ending but I certainly wouldn't mind a sequel as long as it's written by Urobuchi.