re: immigrants own the place now.
Europe will also absorb its immigrants, and its immigrants will adopt Europe.
You'd better hope so. A lot of immigrants over there have developed the idea that they WILL own the place, and that means transforming Europe into where they came from. Radical Islamists in particular.
Many Hispanics have the same idea over here, but there aren't as many of them compared to the Hispanics who want to be part of the American system, and even the "La Raza" end of Hispanic culture, at this point in time, doesn't carry the dangers of the radical Islamist culture.