No, we shouldn’t. Our planet’s healthy carrying capacity of humans is about 2 Billion at a somewhat less-than-first-world level of totally vegan quality of life, or somewhere around 500 million at a first-world omnivore quality of life.

We are so far beyond the planet’s healthy carrying capacity that the planet is dying before our very eyes, for those with the will to actually see what’s happening. Fisheries are collapsing everywhere. Topsoil will be gone within the next 60 years. Wild populations of all animals has gone down by 60% in the last century. We are in a human-caused extinction event that rivals the worst that has happened in geological history not only in magnitude, but also in sheer velocity. Even ELE-class asteroids took centuries for the majority of their extinctions to conclude, and we’re doing it in mere decades.

Sure, the planet could “support” 10 or 20 billion or more, but only by placing 100% of all arable land under intensive use, and by fishing every inch of the ocean; whereupon all non-farmed life will be pushed to extinction and the planet’s biosphere will collapse, bring its carrying capacity rapidly down to 0 humans.

We desperately need far fewer humans on this planet, and as soon as humanly possible.