Blaming "capitalism" for the tendency of homo sapiens to grow and displace rather than stabilize and share is a big mistake. Capitalism means only that production decisions are made by people with a financial stake in the outcome. Everything else is up to consumers. Capitalists will do whatever the consuming public can get its act together and insist upon by boycott or political constraint.

We want economic growth because it enables population growth, and we want population growth because we are critters, and that's how we roll. The Chinese tried the one-child policy, but it didn't work. We can dream of a world where everyone has enough and we can all get along, or we can believe in a world where, when we run out of space and stuff, everyone fights for it. If we believe in the latter, we must rely on technology to put off the evil day when said runnings happen.

The Four Horsemen stand ready to stabilize the population. Always have, probably always will. We need to cope, and positing the end of capitalism with no proven successor does nothing to help. We need better incrementalism, not "repeal and replace" when we have no replacement.