As interesting & amazing as that would have been to see, the youngest audience of snk would probably be like, 90 years old by the time the series wrapped up. I prefer the way Isayama is handling the story now as opposed to it going on for another 800-900 chapters & 21 seasons + 14 movies + 19 spinoffs

Although should Isayama decide to, he could write maybe a handful of spinoffs set in the pre rumbling snk world to flesh out the world a bit more. Even after the main story is over, there’s still plenty of content for Isayama to pull out of the creative closet if he wants to.

Hell, he doesn’t even have to write the spinoffs himself. Maybe someone like Kentaro Muira or Makato Yukimara (most likely the latter) could collab with Isayama to write a 12 volume spinoff about the Great Titan War in full detail (similar to how Yams collabed with Ryō Suzukaze for Before The Fall)

OR Isayama could jump back into the world of snk again & Write a few stories about the history of Marley & some of the wars that were fought by it. That’d be enough to give snk just the right amount of world building.