Universes were always supposed to be okay. Skaia simply destroys one planet for the chance for a new universe. For example, the trolls' universe is fine. (Well, minus the billions of dead trolls killed by the vast glub.) The kids' universe was sick.

Oh, I see! Thanks for letting me know~

I guess if it weren’t for the Vast Glub, and the fact that all the mother grubs were on Alternia, the troll species could have survived. Alas!