"Yet, as no EU country has a birthrate that will enable it to replace its present population, immigration is certain to continue,"
Non-sequitur. Japan, for one, would rather have a declining and graying population than adulterate its precious monoracial identity. Unfortunately white, Northern European, Christian America long since abandoned its founding homogeneity and swallowed the post-Lincoln snake oil of multiracialism and melting pots. There is no successful multiracial country in the world, and the USA has only held together (following a war which killed nearly a million of its men) by being cowed into unity through the largely imaginary threat of foreign enemies: the Nazis, the Japs, the Reds, the Yellow Peril and now the Muslims.