Immigration: Shift To The Orient.
Something else the "all Whites will go extinct" post overlooked is major global dynamic changes.

What happens when the largest countries, labour forces, and economies in the world, suddenly start to rapidly lose their labour force? They start aggressively addressing this via replacement migration.

"China/ India never would!"
We heard this about Korea and Japan, yet after continuing to decline, they folded and started aggressively pushing immigration.

The significance?
When China and India attempt to bring in more workers, the only place with a surplus population (above replacement fertility rate) will be Sub Sahara Africa; they will need to import hundreds of millions of workers to maintain their labour pools and prop up their economy... or economically collapse.
Western economic migrants (Nons in the West) are also likely to mass migrant to the East.

I look forward to the day I see India and China viciously compete with each other to import hundreds of millions of Nons.