Africa is in a dangerous position. Yes they have a high birthrate. But its only in certain countries. And it's dropping for the dame reason it dropped here. Education, stable infrastructure and good sanitation.
But as a continent its over reliant on the rest of the world both east and west for imports, especially in the agricultural and medical fields.
When we go, they will go first. The proverbial canary in the coal mine... 

 It may just be for "medical reasons" that Africa will thrive. Africans didn't take the covid injection. Watch the video.