No, we're not quite thinking of the wave of migration entering Europe just at present although obviously open borders do have their attractions. Rather, we're thinking of migrations in which people sort themselves into the sort of State that they desire. Like, for example, American "liberals" moving to Canada to find a society that they desire rather more:
“If Americans want to live in a country where there is an investment in public education, where people aren’t afraid of going bankrupt because they get sick, and where democracy is taken seriously, they should move, because an alternative exists,” said Tom Kertes, 43, who moved from Seattle to Canada with his now husband Ron Braun in 2007. ... For Laura Kaminker, however, that’s completely out of the question. In the 20 years before she and her partner Allan Wood finally moved to Canada from New York City in 2005, she had “lost hope” in the country she saw plagued by “civil liberties crackdowns” and “endless wars”. Although she still has her American citizenship, she doesn’t vote any more in US elections, and whenever she comes back to Canada after visiting family or friends in the States, she breathes a sigh of relief.
“Every time I say, ‘God, I’m so glad to be out of that crazy country,’” she said.
That's not a view of the United States that we share but then we are liberals not "liberals". Chacun a son gout and good luck to all who sail in her is our motto. And if you don't like the society you're in but can see a better one, by your lights, just over the horizon then great, move to it.
It certainly strikes us as a great deal more honest, more adult even, to go and live in a society that operates as you wish one did rather than try to insist that your 320 million fellow countrymen must follow your own plans. It's not so much that we would say good riddance to those who with to be more statist, it's that we do indeed understand that different people have different ideas about what the good society entails. and we're just fine with people going off to one they find more congenial. As, of course, is the foundational myth of the United States itself.
It's just that we'd really rather hope that the tolerance would be mutual, that we might move, or if they do we might remain, in a society more attuned to our own tastes and prejudices but that never really does seem to happen, does it?