Yeah, unfortunately social sciences (esp. demography, economics, sociology) have been fixated with lowering birth rates since the 1950s. Only very recent did that they start to pay attention to negative birth rate and its consequences.
And yet political fashion still holds sway in the West, despite voluminous evidence that we are intentionally 'underbirthing' ourselves to extinction, or at least to dhimmitude.
I believe that there have been several recent books by Conservative authors touching on these issues, but because they are by Conservative authors they are ignored by the mainstream press who continue to preach abortion and tiny families to white Westerners but bleat "diversity" and "acceptance" of everything when it comes to others