Even larger realms can still feel the annoyance of monsters in their frontier regions. But by that point they're just annoyances, not real threats. With the very long list of realms on Dwilight, combined with the one noble per family rule, right now the smaller realms have very few nobles than would be desirable for survival. Either all of Dwilight becomes dilute in nobility (unlikely), or those small realms all eventually disappear. But if Ordenstaat has taught us anything, it's that people would still stick to a dying realm with one region that has about 1 population with no food and no income for a long time.
