When you have that many people in cities you need either nigh on unlimited surburbia and magical public transport OR a willingness to live in a compact space.
Western housing crisis results from an unwillingness to mostly have dense cities and sensible suburbs with dense multi family blocks interspersed with common parklands.
We can't all have a McMansion with indoor shooting range and swimming pool.
I’m not debating here fictional solutions to how urban areas are being built.
I’m just stating the fact that due to a still very much accelerating population explosion until 2100 combined with a decrease of habitable space it will inevitably create a huge (further) boom in house prices. Wether we start accommodating people in shoe boxes or McMansions has little impact on what I am saying, because the point is, if you buy a nice property today then it will go up in value because there will be market pressure and anyone who will be able to afford a nice home will outbid each other in the free market for the stock of nice housing which we have.
Western housing crisis results from an unwillingness to mostly have dense cities and sensible suburbs with dense multi family blocks interspersed with common parklands.
We can't all have a McMansion with indoor shooting range and swimming pool.