Thanks, is very good to read more about the bottleneck issue. You will certainly like Toby Ord's view. He too talks of a precipice we have to pass https://www.youtube.com/watch?v=eMMAJRH94xY (google his Table 6.1)

And then the important difference between extinction versus collapse. The latter leads, as your Wiki-link indicates, to a sharp reduction in the size of a population and to a genetic bottleneck.

If I add anthropologist Joseph Henrich's view, as Scott Alexander* puts it: "Humans evolved to transmit culture with high fidelity. And one of the biggest threats to transmitting culture with high fidelity was Reason. So evolution removed those (risky) genes from the population and successful cultures stigmatized them enough to give people an internalized fear of even trying."

Which matches the fact, prof. T. W. Murphy points out **that only 10% of humanity consists of logical abstract thinkers (NT profiles).

Add to that the 80%/20% Tinder rule Elise Bohan discusses in her book Future Superhuman: Our transhuman lives in a make-or-break century, meaning that 80% of the women are interested in only 20% of the men. And I my guessing that NTers (aka nerds and scientists) rarely make this 20% cut, then exponentially this winner-takes-all, which she sees in our digital era is increasing, will automatically lead to the extinction of NT capacity within society. Corroborating Henrich's point.

So the big question is now, which genes will make it through the bottleneck of the comming precipice? Presuming we have a collapse and not an extinction. Are we at the dawn of transhumanism (the domination of the NT gene pool) or of sentientism not to use the word sentimentalism (of the ST-SF gene pool)?

I realise I'm being terribly unwoke. But heck, nature is amoral and doesn't care one ounce about our sensibilities. It's up to us to understand and adapt or indeed become extinct. What a facinating time to be living in.

*https://slatestarcodex.com/2019/06/04/book-review-the-secret-of-our-success/

**Chapter 18.1 Personality pages 304-308, Figure 18.3 https://escholarship.org/uc/item/9js5291m