If this happened it would make bitcoin look like a joke and a cult, this is how delegitmize a technology by all moving to an island and moving all miners there, it is a bad idea.
...unless we move somewhere to become the majority new hampshire project-style: maybe there are states small enough and liberal enough in conceding citizenship to make it possible. Alternatively grouping a big enough amount of coins/money we could negotiate a deal including quasi-sovereignty on some rock or plot of land (in fiat affairs they call them "free trade zones").
P.S. never underestimate jokes and cults, especially about money