The other places you mention were not islands. People could walk out if necessary.

Unless you can propose at least a rough outline of something practical (e.g. what ships might be used, a time estimate for how long it would take to move all of the people, personal belongings and the hardware, and a plan for how to get 24 million people to willingly leave their homes without a fight) I think you should give it up.

As I said, it’s worthwhile to discuss alternatives, but it’s not worthwhile to continue to discuss ones that are obviously infeasible.