a financial crisis isn't the end of the world when and if it happens. in the long term states, nations and peoples can survive these things just fine.
and demographic crisis is hitting the west just as hard as china, plus the local circumstances make it much worse in the west because here it's coupled with mass immigration which results in straight up ethnic displacement over time.
for the west, low birth rates mean you're gonna be outnumbered and dominated by immigrant populations, the same immigrant populations that are constantly being taught to hate white people for their evilness. as soon as these hostile immigrant populations capture enough state power, this will result in increasingly oppressive state discrimination against whites, eventually culminating in genocide.
compared to that, chinas birth rate problem is a meme. they'll have to figure out a way to handle increasing numbers of retired boomers, at worst this means a lower material standard of living. not great, but continuing industrialisation and technological progress can offset a lot of these problems through increased efficiency and productivity. their problems are not at all comparable to the bleak future awaiting the west.
Demographics in this context is more about the number of young warm bodies you have that can boost your economy by consooming and working.
More young people and population growth entails economic growth, because more young people means more workers, who in turn buy shit as they grow up and put some of the money they make back into the economy via mortgages and investing.
China and the rest of the Asian tigers and practically all of Europe have sharply declining birth rates—not only will their economies stagnate, but they’ll face downward pressure due to the number of boomers cashing out outnumbering new tax paying young people putting money into the system.
America has relatively stable demographics (birth rate is slightly below replacement level at 2, but immigration counters this). Not good, but it stands to do far better than most of its competitors in this area. This is linked to the increased amount of people living in suburbs in the US compared to Asian powers and Europeans, as city dwellers have had lower birth rates across history.
“But America will be less white! Since brown people are poor they will make America poor too! Only le Wyte man has the cognitive skill and cultural sensitivity to contribute the economy by working basic bitch jobs and buying used cars!”
America is a consumption based society, and the demographics issue is solved by warm bodies who do just that. America might have a problem if they were importing illiterate third world sub Saharan Africans who have no concept of national laws like Europe, but all of the reduction of whiteness comes from an increase in Hispanics, who are willing to work even in racist stereotypes (they’re lazy third workers in Mexico yet when they immigrate they out compete whites in the wage slave market). Hispanics also intermarry with whites at high rates and often reach real financial success relative to where they started from; effectively integrating into the American machine instead of trying to suck it dry and burn it down in some sort of brown commie revolution like the left fantasizes about. Its very similar to immigration to America in the past where poor Germans, Irish, and Lithuanians came here, got seethed at by the Anglo descended whites for being dirty immigrants and stealing jobs, before each group became indistinguishable from the other over decades.