Let's do some math. Today, there are approximately 8.2 billion people living on the planet. The current rate of increase is that there will be ~2billion more in the next 60 years.
Even if the population starts declining for some reason, it would still take centuries even millenia before it becomes even remotely problematic.
Just look at South Korea, with a birthrate less than 1 they are expected half their population by 2100. Sure, there are a million more Africans being born so the overall population on earth may remain the same but to pretend this won't have a devastating effect on the SK economy and culture is delusional.
Let's do some math. Today, there are approximately 8.2 billion people living on the planet. The current rate of increase is that there will be ~2billion more in the next 60 years.
Even if the population starts declining for some reason, it would still take centuries even millenia before it becomes even remotely problematic.