They aren't currently living that life so not that many people would want to leave, and leading an exodus of a couple percentage of their population would only

They aren't currently living that life so not that many people would want to leave, and leading an exodus of a couple percentage of their population would only hurt their position even more. Most people just rarely ever want to leave their homes until after a disaster has been realized. There is risks anywhere you live, they know their fight, and they are currently making a decent life. Rolling the dice somewhere else just wouldn't be that attractive of a position when it could easily be an immediately worse situation.