I think Dwilight is more the way it is due to geography than due to lack of nobles. Even if we had more nobles, there'd still be a lot of distance between cities and realms. Yes, there'd be less food problems and less monsters, but it'd still be as useless to declare war on someone on the complete other side of the continent as it was before.
And I thought the starvation and monster problems would get partially solved with the new estate system anyway. For the same reason as having more nobles would help with those.
