This just looks like basic biology to me. Yea it will be rough and quite the adjustment, but not catastrophic and totally precedented in nature. We will reach a new equilibrium - like all nature does.
These same people just a few decades ago were saying we're on track for runaway population growth because they couldn't imagine birth rates slowing. Now they say we're on track to go extinct because they can't imagine birth rates every picking up again. There are communities even in developed countries that are at an equilibrium birth rate, and the rest of the world will get there. That's simply how nature has worked over and over. The population will continue to grow, slow, then level off. Maybe decline somewhat, but find it's new equilibrium.
There's pretty simple logic to this too from natural selection: the types of people who don't want kids will see their genetic line end or can't, the people who do want kids and can will see their lines continue. The remaining over time will be people more and more inclined to have kids and the environmental effects will decline the population until we're at a sustainable level. Nature is self-correcting, always has been, and there doesn't seem to be any evidence for why that wouldn't just happen here too. These same corrective mechanisms are the same in the economy.
These same people just a few decades ago were saying we're on track for runaway population growth because they couldn't imagine birth rates slowing. Now they say we're on track to go extinct because they can't imagine birth rates every picking up again. There are communities even in developed countries that are at an equilibrium birth rate, and the rest of the world will get there. That's simply how nature has worked over and over. The population will continue to grow, slow, then level off. Maybe decline somewhat, but find it's new equilibrium.
There's pretty simple logic to this too from natural selection: the types of people who don't want kids will see their genetic line end or can't, the people who do want kids and can will see their lines continue. The remaining over time will be people more and more inclined to have kids and the environmental effects will decline the population until we're at a sustainable level. Nature is self-correcting, always has been, and there doesn't seem to be any evidence for why that wouldn't just happen here too. These same corrective mechanisms are the same in the economy.