Who really care seriously?
People move where they can earn more money and Frenchmen are not an exception, they are even the best example.
I live in this country and I know no matter how France is threatened (it's not as horrible as you think), money is the first priority of the citizens.
Patriotism, nationnalism, xenophobia, that's sound good 2 months before an election but the D day people suddenly remember what they need to live and if the country can't satisfy these needs, people leave.
You can moun in thinking about the "decline" of Europe, but from inside, nobody really care as long as we are still paid enough to buy the new Iphone or the the new Xbox.