Absolutely stunning. Nice nod towards the end saying she felt she was just getting started despite having done more in a few years than most Avatars did their entire lives. Really establishes the notion, finally, that she is indeed Legendary. You can easily fill in the details as the city expands around the new spirit portal and the Earth Nation refocuses along self-deterministic lines. The only regrets, such as they are, is that after seeing such change in the Earth, Water and Air nations we never really got a good feel for what the Fire nation was like during Korra's time nor any indication of how it may evolve in the future.
When we got to the Korrasami part I pretty much flipped my lid. Amazing way to end it on a high note.