I wouldn't want a new nation... But i would like to know how the government would reflect the new leaders.. I would be interested to see how the people how people who was in high ranking officers would like there new love and cuddly leadership..Seeing that allot of the people in government might not like how the fight ended because of they lost there rank and there power over people.
Unlike the ending i doubt that everyone was able to get along with there new leadership... There is to many unanswered question...
They don't need a new element to bring in another season...
Also i have a theory that Some of the non benders in the nations might be airbenders that haven't learn the skill yet.....