Last time I was thinking about it, I got to a more optimistic solution... but time will verify what is true. A couple of ideas: If someone moves around, he/she's probably more capable of adaptation than many others. He/she's probably also more intelligent than an average Joe. They're also less likely to have a family and probably around the age where they might want one. So it's quite probable, that it's really a migration of talent. This talent positively influences the destination country (as do the taxes you pay there)... In the end - one might hope that by migrating, you're not only helping themselves, but voting with their actions and supporting the laws they accept...

Oh well... time to go back to reality ;)

No, what would happen if everyone did that is that a lot of people will say "oh, <insert country here> is doing a really good job at maintaining freedom", and so a bunch of freedom nuts move there and (we're assuming everyone does it, remember) that'll be a large- and passionate-enough niche (they're passionate enough to move for better freedom, remember) that they'll have influence over the government and be able to keep it from happening.

Also, as much as we hate to admit it because it makes us feel insignificant, "if everyone does it" is not a very good way to make decisions. Unless you have a lot of influence over many, many other people, nobody else is going to do it just because you did it.

Well if you take it to that logical conclusion, you first reach a point where all the freedom-lovers are together in the last free country, with nowhere else to go. That concentration of effort should help matters considerably.

A long essay on why the good don't associate: http://lesswrong.com/lw/3h/why_our_kind_cant_cooperate/