This isn’t exactly news (Milton Friedman, no doubt among others, pointed it out years ago) but you can’t have both open immigration and a welfare state. Mark Krikorian has some related thoughts:
I can keep playing this game: “it’s simply unsustainable to have a libertarian immigration policy and a post-national elite that has no concern for sovereignty,” “it’s simply unsustainable to have a libertarian immigration policy and a public school system,” “it’s simply unsustainable to have a libertarian immigration policy and laws requiring emergency rooms to treat all comers regardless of ability to pay.”
At some point you become like the Ptolemaic astronomer who adds epicycles on epicycles to avoid the bitter conclusion that the Earth is not, in fact, at the center of the universe. Occam’s razor would suggest embracing the simpler explanation — mass immigration is incompatible with modern society and should be discontinued. It makes no more sense than geocentric astronomy, and it’s a lot more harmful.
As Jim Bennett is wont to say, “Democracy, immigration, multi-culturalism: Pick any two.”