Some people might try to perpetuate their society by recruiting people from the fertile half of the earth. But that wouldn’t work. Immigration is the painful process of leaving behind one culture and way of living so that your children and children’s children can enjoy a different future. No one would be willing to undertake that traumatic process in order to move from a society that was reproducing to a society that was fading. There wouldn’t be the generations required to assimilate immigrants. A sterile culture could not thrive and, thus, could not inspire assimilation.
Instead there would be brutal division between those with the power to possess the future and those without. If millions of immigrants were brought over, they would populate the buildings but not perpetuate the culture. They wouldn’t be like current immigrants because they wouldn’t be joining a common project, but displacing it. There would be no sense of peoplehood, none of the untaught affections of those who are part of an organic social unit that shares the same destiny.
Within weeks, in other words, everything would break down and society would be unrecognizable.