This is not the right strategy to increase player density. In fact this may be the exact opposite of the right strategy. D'Haran nobles are not going to join other realms if they lose their estates. They are either going to emigrate or just quit the game. If you want to encourage the players to bunch up, have the Monsters attack the realms with low player density. They actually have ground to give.
I personally have to say I agree with Mr. Panda.
