I have a couple of points to make:
1. The whole point of the rogue is to make the West mipossible to conquer. The simple reason is, before that happenned nobles were spread too thin and there was no reason for conflict. It was really boring. Players need to understand that too much expansion room is no good.
2. The previous situation worked better, when the monsters were confined to the west. Then realms could focus inward and human wars and conflict were more likely. For example the massive war with Luria Nova against most of the island.
I suggest the best solution is to confine the rogue hordes to the west again, and make the west unlivable. That will force all knights to turn eastwards and interesting wars will start again.
