Isn't it easy for EU residents to change countries of residence ~ easier than before the current level of "unification," and (more to the point) easier than for people from non-EU localities?

If any group is likely to "take over" from "native" Belgians, I would think that non-controversial northern Europeans would pose a greater "danger" than any of those dreaded dark-skinned folk.

Well, I forgot about Turkey. With them in the EU, I suppose it may be plausible to live in fear of takeover by Turks.

Are there enough Turks in the world to become a majority in any Western-European country? If so, more than one of the smallest nations?

Of course, those third world people do tend to multiply more rapidly than us more "civilized" nations. So many of our young people are more interested in "career" than "family," and avoid childbearing like the plague.

The future, obviously enough, belongs to those who get born. If any "nation" or "race" or other subset of humanity should ever completely die out, they have no one to blame but themselves.