Aren't most migrations just up to having a place that they could stay at of which they enjoy? Heck, even if there was Bitcoin, I'd still honestly opt to leave China if I were to be living there, which I'm not btw. Besides, US could plainly be said to be the center right now, with its domination over other countries. China is fighting it, but hell, I'd choose US if I were to be asked to pick between the two. Millionaires don't even need to pick a country they'd think they need to stay in for safety, they choose a country that could let them retain their wealth for as long as possible.
Some millionaire move there wealth not because of the countries they are in will steal it but because they stole the money and are looking for countries to hide it away in, large millions if not billions leaves African countries to other countries from corrupt leaders/politicians and are hidden off.
I hope bitcoin does not become like an -option/alternative- for these likes.
Well, it's not as they could stay after stealing much money from the citizens. It's actually almost a natural action to be done, and if someone didn't do as such even after stealing billions, then hell the backing behind them probably is a power equal to that of the president of the country, or even greater.