Earlier quoted context omitted.
"Extremely simple?" There's lots of reasons it isn't so simple for people. 1) Barriers to work and emigration 2) Language barriers - I know that learning a new language isn't impossible (I know a little Spanish but I'd hardly call myself fluent), but I speak only English fluently, which limits me to a handful of nations, many of which are nearly as bad as the United States (hey UK, how are those surveillance cameras?…
On the other hand, at the moment you are still free to leave. You might not be so lucky if you wait.
But there's always going to be more people who want in than out, and I don't think there's ever be point anywhere in the near future in which this is going to change...