[greygoo222]

Let me try this again. High fertility is the rule, not the exception, of human behavior. Human population has, give or take, consistently increased since the invention of agriculture. Modern trends of society-wide low fertility are an unusual phenomenon specific to a cultural context enabled by advanced technology and high global populations.

Imagine your prediction pans out until there are 10 million people worldwide, the size of a large city. It won't, because this entire premise is deeply ridiculous, but imagine. How is this society going to maintain the same culture we have now? Are all these people unable to recognize that low fertility is leading to extinction, despite the very obvious historical data, or do they just not care? How long do you think people will even have the capacity to keep producing and distributing birth control?