> We need to make cheap housing work in places that have not experienced large-scale depopulation.

This will require incredible subsidies both to build and maintain, which I fully support, but I think is politically untenable due to everyone’s unwillingness for taxes to go up while the developed world already carries enormous sovereign debt loads (>100% GDP).

We ate the seed corn, broadly speaking, to maximize the gains for some at the expense of the young and the future. Hopefully I’m wrong, and both taxes go up and the bond market will support more borrowing in the near term for spending that actually delivers value.

In the long run this trend will depopulate all the cities, so we'll get there one way or another.

May the economically fittest mega cities win I suppose.

large parts of vienna have also been destroyed in the wars, for example 80000 apartments were destroyed or unusable. so it's not underused real estate but more like empty space in the city to develop from scratch. any other city that is not densely packed can have that. new development currently happens on empty space that was never developed before.