It'll be really interesting when most of the world is "developed" and immigration can no longer provide artificial "growth" for countries like those in the West and the Gulf states. Why mass tahriib to Germany if you have roughly the same tech, job ops and living standards as them? The world should get very, very interesting when this population collapse happens nearly everywhere in 50-100 years and they run out of fossil fuels and rare metals & minerals or at least get to a point where the ROI for extracting those things isn't worth it. Global capitalism might just buckle.