Looking at Seven Havens' setting and premise, a world with two Avatars where there is conflict between Benders and Non-Benders, I cannot help but be reminded of the first two seasons of The Legend of Korra.

It seems to me that this new series will be the writer's second attempt at these storylines. This time, without all the production problems they had to deal with back then.

Behind the Scenes

Without a doubt, The Legend of Korra's biggest issue was behind-the-scenes drama.
It was originally meant to be a one-season show, but it kept getting renewed amidst production, forcing rewrites.
This was bad because the narrative, characters, and setting were not designed for a long-running show.
Also, executives did not let the writers tell the stories they wanted, like KorraxAsami.

Seven Havens seems to be avoiding these issues by just having better planning.
The show has been confirmed for two seasons, with it having reportedly already been renewed for two more early in production.
Also, the writers seemingly have more creative freedom this time around.

Setting

With Aang and Co. having already visited every notable landmark during The Last Airbender, The Legend of Korra needed a new setting; thus, Republic City.
However, while functional in Korra's first season, it became a ball-and-chain in subsequent ones, with every conflict needing to involve it because most characters live there.
Also, the 20th-century vibe removed much of The Last Airbender's charming mysticism.

Seven Havens' solution is "The Cataclysm".
Complain all you want, but narratively, it serves as a reset button, allowing the writers to start fresh while keeping the series' lore.
Also, there are SEVEN havens, which means the show will have 7+ potentially brand new locations to work with.

Characters

As stated before, The Legend of Korra's characters were not designed for a long-running show.
Yes, it gave us storylines like the Tenzen and Beifong family drama, and, in Korra's case, the writers turned this weakness into a strength, with her PTSD arc from everything she went through. However, it also left Korra's Team Avatar—Mako, Bolin, and Asami—underdeveloped, with them lacking an overarching storyline besides their relationship drama.

With Pavi's reincarnation having reportedly been delayed, just like with the setting, Seven Havens seems to be wiping the slate clean by ensuring that all Last Airbender and Korra characters are long deceased.
Also, I'm personally already feeling potential in Seven Havens' cast. For example, there's Jae, an initially loyal conscripted Bender who gradually grows disillusioned with the havens' system.

Groundwork

Love or hate Korra, you cannot deny that it laid the groundwork for Seven Havens, with her leaving the spirit portals open and the introduction of the Dark Avatar being partly the reasons why Nisha and the cataclysm's cause are so discussed.

In fact, while people hate on Korra for losing the past Avatars, Seven Havens actually seems to take advantage of it.
In The Legend of Korra: An Avatar's Chronicle book, Tenzen theorizes that the past Avatars are lost to all future reincarnations, including Korra for Pavi.
Now, this potentially makes the cataclysm mystery far more interesting, since Pavi cannot just get all the answers from Korra's spirit.

So I've been thinking about how each Avatar series has been about the protagonist balancing something.
The Last Airbender was about balancing the four elements, symbolized by the four nations, while The Legend of Korra was about finding spiritual balance in a rapidly modernizing world.

So, since we could identify the previous series' conflicts by looking at their settings, doing so for Seven Havens makes it pretty clear that something must be done about the world being a wasteland.

The Cataclysm

For my thoughts about the cataclysm, I 100% believe Korra was framed.

Personally, I'm with the theory that this world is a result of an unresolved plot threat from Legend of Korra: humans exploiting spirits.
Basically, humanity started using spirit power as a resource. However, it turned out not to be the unlimited clean energy they thought. In fact, they were essentially consuming the planet's life.
Korra may have tried to intervene, but by then it was already too late, resulting in the planet undergoing an "energy shift".

This theory tracks with how benders seem to be treated in this new series: Exploited as resources.

The conflict

With the series confirmed for two seasons, I'm guessing the first will revolve around Pavi and Co. learning the truth behind the cataclysm before culminating in her and Nisha having a falling out regarding how to balance their world, which will be the primary conflict for season two.