I guess immigration laws are not in place because of that "fictional concept", but rather because those inside the country are so afraid that immigrants would take away from whatever they believe to be entitled to.

I also believe there will come a time, when all industrialized nations will open their borders, at least for honest immigrants. Preferably all those nations at the same time. Already, enforcement of immigration regulation is impossible in many countries. And the extent to which that regulation seems to be working might as well stem from the fact that most people, no matter how poor or desperate actually don't want to leave their home country.