I was first alerted to this issue 20 years ago reading a booklet (published Nov 2003) on the fertility crisis by Malcolm Turnbull, who later became Prime Minister of Australia, yet did nothing about the issue when in power.
Re-reading it now, I am struck by how much worse the situation, already bad in 2003, has got. Almost all countries mentioned have had total fertility rates fall substantially, some by over 30%!
Korea from 1.14 to 0.7
Japan from 1.4 to 1.0
Not only that, but what followed in many places was 20 years of an increasingly aggressive anti-natalist agenda. For some mystifying reason, perhaps it was an issue they never actually meant to solve or fight against.
It's a good thing there's now room for more and more independent research and media to talk honestly about the problem.
Yes, Elon Musk has done a lot to raise awareness of the issue.