You are thinking it would just be a gentle way to reduce population but even if women did artificial insemination to keep your 1/20 birthrate, the world as you know it needs a lot of people to run it - farmers, network engineers, maintaining all the systems that make your comfortable existence possible requires a baseline population with particular skills, of working age. There is a reason technology increased with population growth.
The natural world would be better off, probably. Humans would be in for a rough ride, and would probably die out.
The world would be filled with old people.
You are thinking it would just be a gentle way to reduce population but even if women did artificial insemination to keep your 1/20 birthrate, the world as you know it needs a lot of people to run it - farmers, network engineers, maintaining all the systems that make your comfortable existence possible requires a baseline population with particular skills, of working age. There is a reason technology increased with population growth.
The natural world would be better off, probably. Humans would be in for a rough ride, and would probably die out.