Well…to be fair, you can’t dismantle a system like Sibyl in a day…or an episode for that matter. It makes sense that they chose to keep everything the way it was for the end. It’s not the most exciting way to end the series, but it’s logical. And the only way we could have an ending like that is if Makishima is killed…which was something only Kougami could do.
So from here, I guess Akane and Kougami go their separate ways, dispensing their own forms of justice. Akane follows the system while Kougami, I assume, tries to help those that the system cannot protect. Something like that. The wheel turns and the next generation of Akane appears…thrown into the world just as she was. Personally, I don’t think there’s enough for a second season…I assume this is supposed to be an “ending”. Even though there’s still the task of destroying the system, I really don’t know how they’d make a season out of it. It would probably seem completely different from this season.