It was once stated in Bleach manga by Urahara that,
Urahara details that without the Soul King's existence, Soul Society would be rent asunder. The Soul King is the "linchpin" and if that linchpin is lost, then the world would simply crumble away and that is the way of the world. Wiki
But then afterwards,
Yhwach completely absorbs the Soul King.Wiki
How does then the Soul society continues to survive into the future?