> You imply that it won't.
> I don't see a fundamental reason why humans would stop at 8 billion
This is not a guess based on how we subjectively feel about the world, but the current UN estimate, based on a lot of data.
"By 2100, the global fertility rate is expected to dip to 1.9 births per woman", so below the replacement rate, which is slightly above 2.0.
https://www.livescience.com/65732-world-population-will-stop...
https://www.un.org/development/desa/en/news/population/world...
https://www.pewresearch.org/fact-tank/2019/06/17/worlds-popu...