You got some serious dicks..then I see Tenzin and the brothers (Mako and Bolin). I think the role of the Avatar is to encourage cooperation in the world..and that is one task the Avatar has failed at in multiple incarnations. That is why Amon is so successful, he is addressing the issues that the Avatar has failed to address.
The 'wild card' in this thing is going to be the lack of countering against airbending and folks like Asami Sato. Airbending, granted is a lost art, and isn't as important as 'normal' folk like Asami