And people still argue that over population is not a problem.Housing has to be affordable. Poor housing has consequences which affect everyone. Whether it is the direct effects of mold and insects to longer term consequences which affect productivity such as stress. The large projects of the past haven't always worked well. (But some were successful.) Requiring that developers put in a certain number of affordable homes in more expensive developments has not worked well.
But public housing was never originally intended to be permanent housing. That changed and when coupled with the neglect of the 1970's - poorly-run, poorly-financed developments marked by areas suffering from middle-class flight, they failed.
I really like Turchin's book "War, Peace, and War". He explains why good times lead to bad times and bad times lead to good times. Perhaps we can resolve the housing problem by extreminating enough people to make housing affordable again, and force employers to pay better wages by creating a lack of available workers? May be a famine, or plague, or war would help. Humans should stop trying to prevent bad things from happening, because the bad leads to the good.