If we were back in the 80s... that mentality, and that time of growth of production
and plopped the declining birth rate of today, we could come to many conclusion like Musk discusses.

However, things are not
Nothing is the same.
There will not be a "normal" for at least 50 more years.

So, the 80s and 90s put off the great problem of high production manufacturing by introducing planned obsolescence. Both in the products and the marketing.

What a different world it would be if we had plowed that money into much better housing and infrastructure instead of filling land fills... but we didn't.

Soooo

What we are facing is a huge die off over the next decade.
On top of that, the hedonistic ways of women will/have resulted in decreased ability to get pregnant as a species.

Enter the ice-age and "modern"-farming-failure.
Just when we need more food from the places that can still grow it, we are going to see a crash as soils just will not grow our monoculture crops any more.

So, we are going to see a die off of more than 50% world wide.
Unless we stop these useless wars, kill off the Davos group now, and start working on preparing for the ice-age.