Other than genetic minimum population numbers, there should be civilization minimum population numbers, and I'd suspect modern technology would allow for a few hundred(?) million people to hold up the same standard of living and progress.
It's more plausible to assume our population peaks, as predicted, then falls, and then levels out and stabilises | oscillates.
It'd be odd for it to peak and then plummet to zero from 10 or 11 billion.
Population dynamics are not very insightful. We see villages which had population for three millenia deserted, with nobody wishing to live in that empty place and grow their cattle or whatnot.
In your opinion, sure.
For most that's just a fanciful outlier possibility.
The economic issues are only projected to get worse. There are no known mechanisms for fertility to rebound.
Yet you assume with certainty that the trend will reverse. Great to be you.
Correct. This is seen in all manner of real world dynamic systems with constraint pressures. "Stabilize" in this context includes "bounces up and down between a few too many and a few too little".
Now you're getting it.
> There are no known mechanisms for fertility to rebound.
Now you're being silly and all doom and gloom.
> Yet you assume with certainty that the trend will reverse.
Predict with high probability based on looking at lots of dynamic systems, yep.
> Great to be you.
This is hardly an esoteric or unusual viewpoint, perhaps you might look at cheering up and doing away with the OMG we have to breed w/out limit or die!!
Seems a tad black or white for the much richer more complex world we live in.
We haven't seen any population rebounds yet. Not even close.
The solar system is still spinning, perhaps you might widen your outlook and quantify.
The guide from Applied Mathematics is the only "numbers" that matter long term are -1, 0, 1, sin, and infinity. Systems either dwindle, explode, stabilise, invert, or oscillate ... and everything around us in the universe is part of some system or another.
> We haven't seen any population rebounds yet.
One example (in humans)
https://www.nature.com/articles/srep04541
Another example of a type of constriction with evidence that this likely occured in human population: https://en.wikipedia.org/wiki/Population_bottleneck
Many many examples in nature (eg: cyclic boom | bust of kangaroo populations).
Have you considered looking about before uttering readily falsifiable platitudes?