A Boring Dystopia

Birthrates in developed nations have already plummeted with the introduction of the anti baby pill. We don't need to hit any resource barriers for a population decline.

The global population projections I've seen estimate the world's population continuing to increase to about 10.3 billion by sometime in the 2080s, and then beginning a slow decline from there. I can't say for sure where the limits to growth are, but I think we will reach them before then. Of course I could be wrong, but that's what my gut tells me.

And a big reason for that isn't just the growth in global population that is expected to continue for several more decades, but the imperative for economic growth, even in already very wealthy countries with advanced economies (and declining birthrates). When we do inevitability hit these physical resource barriers (and again I think that will happen before global population is projected to peak and begin declining), I think we will experience a significant global economic crisis that could plunge hundreds of millions, if not billions, back into extreme poverty, and that could cause average life expectancy to decline dramatically and infant mortality to increase. I think that could lead to a pretty significant and probably very sudden drop in global population, especially if it is accompanied by war and agricultural disruptions from climate impacts.