This show hasn't even come out yet. We don't even have any solid info, no trailers, just a little teaser and some leaks. The idea for this series is definitely controversial, but we'll see if it sucks when it premieres.
While I'm not a fan of the whole post apocalyptic setting (I think it's been way overdone), I'm willing to give the new series a shot. I wouldn't turn it down just because of the setting. Give it a try when it comes out, you might like it.
What if the new Avatar tries to send a message to the past (like they did in X-Men: Days of Future Past) in order to prevent the cataclysm from ever occurring?
This show hasn't even come out yet. I hope they don't make Korra as a villain.
But I also wanted a Avatar that is a villain (whether if its pure evil or an well-intentioned extremist) because we never saw an Avatar Villain (just heroes and anti-heroes)