Making small kingdoms when there are big kingdoms seems worse than making a big kingdom and trying to destroy the bigger kingdoms then make lots of smaller kingdoms
The 'moot is three federated realms, and we do just fine.
Also, if you are waiting for Astrum to be destroyed before setting up smaller realms, you'll never do it. If Asylonians are so united and strong and whatnot, splitting up will only make your tax tolerance higher. Being attacked wouldn't be a problem, because all of the realm fragments would join in to defend as one.
I suspect there's more to it than that.
