Time to make history y'all
More like time to make History yeah!
So a big issue with leading a non-bending revolution is those anti-bender sentiments only seems to really bubble over during Korra's era which is almost 70 years after the last avatar show, so I am not sure how viable it is to lead an non bending rebellion. Also I believe it has been seen that the avatar is important to the world in order to ensure harmony so I am not sure why we want to kill them.
Well, here's the thing about this hundred years war era and nonbenders.
This is a time of national identity's and myths being birthed, and with a foreign power invading your nation and trying to conquer it. There really isn't a need for a non-bender rebellion, because those issues are pretty much noneissues to geopolitically, culturally and spiritually speaking... were waging Wars of national and cultural survival.
Especially in canon when the fire benders have literally already committed genocide on a massive scale already and were perfectly willing to do it again when the comet showed up.
And, on the Avatar, they are possibly the most respected person on the planet, for their never-ending quest of keeping peace and balance in the world. They may fail on occasions, but no one ever gave up hope on them doing what is right.
Hell the only reason it happened in Korra was after 70 years of peace and prosperity, and the rise of technological development that gave nonbenders the confidence to take up arms if need be, against benders, along with several new nation-states being born, and several decades of social and political development.