The FSoA also depends on immigration to keep the population increasing. However, the places the people immigrate from won't produce so many useless eaters, and immigration restrictions will likely continue to tighten.
At best, I'd say this chart can give you an estimate of global population for the next 10-20 years. After that it's worthlesss.

https://www.visualcapitalist.com/peak-population-for-the-largest-countries-in-the-world/
RE