We'll see, when and if they actually start reducing their population:
China’s population still growing, census shows—but barely
Moreover, even if the population actually starts declining, that carries its own problems, since "fewer and fewer people in their working prime will have to support a rapidly growing cadre of elderly . . . The top-heavy age pyramid has policymakers worried that China may grow old before it grows rich." In addition, "Entrepreneur Liang Jianzhang, who’s also an applied economist at Peking University, has long warned a shrinking population will lose its innovative prowess."
It's unclear to me how the vote of citizens in *my* country will affect population growth in countries to the south. I would think the same applies to Europeans.