Human populations grow slower the more advanced they are. Most of the first world, including the US, is below replacement fertility rate of 2.1. Without immigration and the like, the US would start contracting. Bringing the third world up to first world is what is needed. That and the other things you said.

[EDIT] Links help: https://en.wikipedia.org/wiki/Sub-replacement_fertility

The timescale for sub-replacement fertility to work its magic is too long--on the order of centuries. We are already in an overshoot scenario, and bringing the third world up to first world living standards will only consume more energy and produce more greenhouse gasses. We're in serious trouble and small tweak to birthrates isn't going to fix this.

>>Bringing the third world up to first world is what is needed.

Again, the biggest hurdle to that is politics. There are deep geo political ramifications on any thing that causes change in economic equations at such massive levels.

Mostly its also the will of the people. The world is indeed a giant stack ranking system, and people do indeed believe in ruining anything it takes to score the most points. Most people do believe in things like their civilization, nationalism and racial supremacy.

If you think of it as a whole, space, asteroids and what humans could do if they work together. The very concept of economy feels like something that limits human progress.

Economy won’t go away, limited resources needs to be managed. A market economy, otoh, is just one approach.

I’m pretty sure the current configuration is just a temporary blind spot. Market economy as an optimization algorithm is pretty neat for a limited set of problems. As a means to handle social justice, collective planning, and a bunch of other problems perhaps not so much. While finding better models for that, we shouldn’t throw out the bayby with the bath water.