Well, season 1 covers volumes 1-4. Season 2 kind of covers volume 5-8 (if you squint at it in one eye and close off the other, anyway). So logically, season 3 can't happen until volume 12 has been released.
UNLESS the author gives them some sort of outline/cheatsheat/GODLY GUIDANCE to let them make up their own ending to it (see the difference between Fullmetal Alchemist and FMA: Brotherhood). But if they're waiting on LNs, then we might be in for trouble because AFAIK, only volume 10 has been released, and it's taking.what 18 months to do one?
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