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This might be a Very Unpopular Opinion, but I'm not overly worried about the creators leaving the Netflix Avatar the last Airbender remake.
Let me explain: Despite how much Mike and Bryan are praised, they didn't come up with everything good in ATLA. Like any project, they worked with a team and other team member contributed many things that fans love about the show. Good team member act as "checks and balances" to prevent personal biases from taking over, and to yield a better product.
Mike and Bryan made ATLA but they also made Legend of Korra. They made Korra without their full team and LoK wasn't as good. Because Mike and Bryan didn't have their full team, many of their biases didn't get ironed out of the final product. And because they were more in control, their inadequacies shone through. Thus, Korra's quality suffered because the creators aren't perfect, and they didn't have others to balance them.
Therefore, I'm not overly worried to see Mike and Bryan go because they aren't the source of all goodness. Just like with J. K. Rowling, maybe it's time for someone else to nurture the franchise.