The Bay Area seems to have 18,000 km² which at 7.1 million people makes is quite dense already.
The bay area average is 868 people/sq mile.
No, the bay area is not dense at all.
If anything I'd argue the steps towards prosperity in an ecologically sustainable way in this scenario are shorter for developing countries, it will protect their ecology (it is the third world who works in the strip mines for the batteries for affluent tesla drivers in California), accelerating digitization is cheaper than traditional infrastructure, it gives them the opportunity to leapfrog over traditional industries, it will drastically reduce the impact of climate change and so on.
This not what I meant. I mis-read OPs
>> welcome the economic decline that would come with growth reduction
as no growth. If the (slow) growth (magically) only goes to the poor they may indeed eventually catch up.
Or put differently, would you forgo having children and grandchildren so that others can have this future you imagine?
That said, your parent comment probably meant “our” grand children, just a guess.