Wanted to call out that this would probably require most of us to never have existed. Specialization is more efficient at the macro level; this efficiency is why there are 7b humans instead of many fewer.
Increases in economic output, agricultural and industrial, make it possible for more people to survive. If further and further specialization lead to more and more efficiency with ever growing population, is there a point where we decide things have gotten worse? Or do we slide down the slippery slope into some hellish future dystopia with 700 trillion people, crammed into skyscrapers full of capsule apartments, subsisting on genetically engineered bio-protein sludge and pacified by neuro-electrical stimulation? Not far off from The Matrix.
Perhaps there will be breakthroughs in preventing aging, automation etc. that will allow for sustainable living then? Maybe. It’s an interesting question.
OTOH, we could also simply descend into nuclear war and reset civilization.
Or have more deadly pandemics ravage our cities.
Strange times indeed.