Hrm... Interesting idea. There will surely be quite a bit of maneuvering of realms trying to convince other realms to abandon their realm and join a new one. "Eston will surely be lost. Join us in Silnaria and we can forge a new realm together on Beluaterra!" Will any realms attack another realm, to force them to be destroyed early, thus ruining their chances of survival and orderly migration to the new land? Will any realms abandon their regions wholesale, and join forces with their neighbors?
This is an interesting idea. How many realms, though, will be willing to give up a city and a few rurals to a bunch of carpetbaggers from another island?
How about if we partially cross-connect the ruler's channels of all the islands for the duration? For example: if EC is going to be sunk, then allow the rulers of EC to message any ruler on any island individually, and allow the ruler of any island to individually message the rulers on EC. Make it just single-recipient letters, not game-wide all-ruler blasts. The rulers of realms can work out deals regarding the immigration of the refugees.
You could make it so that a realm on one of the non-affected islands can set aside regions for the carpetbaggers. We'd have to come up with some game mechanic method for the realm to pre-generate the realm, or something. Maybe designate a duchy or something? Say, for example, that Rio wants to set aside the duchy of Grehk for refugees. They contact, say, Perdan on the sinking EC. The two come to an agreement, and the two rulers create and accept the deal. When Perdan accepts, a Perdan is created on BT, and the nobles migrate en masse to the new island, populating the new realm.
Some way to set up a deal before the realm-wide immigration happens would allow realms that want to do it to move with some form of pre-arranged structure, maybe allowing them to survive.
