The simple fact is that more and more people are able to imagine a future for humanity.
History shows that what a man imagines eventually comes true.
As people in the developing world become prosperous, they will start using the, by then, cheap new technologies to make their lives easier and more interesting.
Once every household has Sky Sport the birth rate will plummet. (Most men prefer to watch football than copulate) As prosperity further increases, many families will prefer to spend their money on Selfish Pursuits rather than kids.
Because of the rampant Baalism God will destroy us all.
DAMN!!! The future does suck!
HB