Do you have any examples or even just any precedents how decades of declines and lowest birth rate in the world have been easily and successfully turned around, or this is all just hypothetically probably not hard?
Ethnicity is more memetic than genetic.
> Look at Norway and Sweden, the people in those countries long ago decided their culture was not worth preserving.
Culture isn't transmitted by reproduction but by socialization. Immigration tends to involve socialization; indeed, the usual observation about future generations of immigrant populations aligning to preexisting native low birthrates in the developed world is evidence of either culture transfer (meaning reproduction not key to preserving culture) or that birth rates are a product of material incentives not culture (indicating that reversing low birth rates at need is a matter of changing material incentives, not culture.)
Either way, the low current birth rates = irreversible drive to cultural death claim is inconsistent with the evidence.
https://slate.com/news-and-politics/2009/06/why-does-iran-ha...
Not...really.
> UN report on Japan's birth rate policy attempts:
And details defects in the specific policies (notably, these defects are, one who is familiar with policies of the type will notice, ways they fall short of the support policies in many European countries that aren't even specifically trying to boost birth rates.)
E.g., a paid family leave policy with low payments and lacking legal force, so many employers haven't actually implemented it.
This is a government making a pro forma show of “doing something” about a problem, not a serious policy effort.