I doubt we will see a migration to the south based on this one factor alone because currencies in the global south will likely be the first to collapse as the petrodollar system gets destroyed, which will create all kinds of economic chaos like we are seeing in Lebanon. What I suspect is that people will move to places where btc will be accepted like El Salvador, as those will be the only hubs in which CBDC’s can be avoided, or they will remain where they are and create an underground btc based economy