Epigeneticly speaking, people who do not have children can still have a huge positive effect on our populations.

On a large scale our population most likely controls itself, in relation to the carrying capacity of the physical and psychological environments we occupy.

Human productivity growth is based on the size of our population which has achieved some basic standard of living.

It could be possible there is a population sink that can form, where the population growth is greater than productivity grows the region's carrying capacity. Keeping people perpetually stuck in poverty and those who would normally stay improving standard of living find it easier to leave.

As parents we should guarantee the basic necessities so our children can start out standing on our shoulders not our feet.

This is the process of exponential growth fiat as stolen. In most families today the children are being born at the same or less standard of living than the parents generation. Forced to focus on smaller problems not greater.

Obviously bitcoin fixes this but even more.

Bitcoins effect on population very interesting topic.