Personally, I've come to the conclusion that densification is a tweak against very powerful odds rather than a sustainable long term solution. Proper 21st century thinking would be to rethink work, mobility, culture, care and how people access things in a way that is modern and sane.
> how people access things in a way that is modern and sane
Unless teleportation is invented, if you want to have access to a large variety of things that are not just generic grocery store/post office/non-specialised gym or similar - you're going to need density.
