Are they worried about a population decline or are they worried that not enough people are being born to sustain the socialist machinery?
They might want to worry about all those fabulous, wonderful pieces of art throughout Europe's museums which will become firewood for all those folks of an Islamic bent who see idolatrous images everywhere.
Pity.
Socilists, fascists, the elite of every stripe have always and forever believed that THEY will, of course, overcome any difficulties by retreating behind their money, their walls and their machinations.
It didn't work for King Louis and Marie Antoinette. It didn't work for Napoleon. It didn't work for Czar Nickie. It won't work for the bankers nor for the oilgarchs..