You know the debate about 10x engineers - and how many people weigh in saying they are real, that 10x may even understate it? Here you have to 10x (minimum) mathematicians. You are suggesting we give that up, that they sacrifice the quiet time mathematicians need to do great work, and devote themselves to raising kids, on the off chance that (some of) their children may contribute more than they will.
Imagine Steve Jobs having his first success (incorporating Apple, selling a few units) or Bill Gates (selling some units of BASIC and random software, how Microsoft started) - then quitting to raise a bunch of kids. Is that a good trade? What are their kids up to today - and could we expect much better even if the had 10 times as many? Would you really expect those kids to accomplish more than Jobs and Gates did?
When put this way, it obviously sounds like a bad trade.
Singapore famously established the social development unit (SDU) (nicknamed "Single, Desperate and Ugly") to encourage graduates to have more children, by organising speed dating events, BBQs, cruises etc. They also have a "Baby Bonus Scheme" [0].
"SDN’s long term goal has always been to help singles realise their marriage aspirations through equipping singles with relationship skills and creating a vibrant dating scene for singles to interact." [1]
https://www.theguardian.com/world/2003/apr/10/gender.uk
https://eresources.nlb.gov.sg/history/events/3c520e6c-dc34-4...
https://www.msf.gov.sg/policies/Marriages/Pages/Finding-a-Pa...
[0] https://www.msf.gov.sg/policies/strong-and-stable-families/s...
[1] https://www.msf.gov.sg/media-room/Pages/Singles-dating-media...
The United States have successfully integrated immigrants of many peoples into a framework of life that is still recognisable as European enlightenment. The natives are now not necessarily Europeans but they have been living and reproducing long enough to be part of the fabric that keeps the original European enlightenment tradition in place.
I wish that was the typical "get in other people's business" tonality.
I like to think of the hard part of raising children as paying the debt we owe to our parents and ancestors. If not for their survival I would be able to say I am very glad and grateful to be alive and experience the wonders of the universe, wonders like math.
So do startups.