Promised Neverland I can understand because the set up of the story can't handle being dragged out or extended too long. On the other hand it's almost unheard of for a battle shonen to end so soon after it peaked in popularity. No doubt the author is being pressured to come up with something to extend the series, but we'll see if they go for it. I'd worry it wouldn't really be that good if that was the case. But I also wouldn't mind seeing an older Tanjiro and crew as the new generation Hashira.
