I havent read all the thread, but most people are commenting on men not pulling their weight (rightly so - they now expect women to take over half of 'their' traditional role of bringing in the bread, but are generally shockingly reluctant to do more of a token attempt at taking on 50% of 'her' workload)
However there is a much wider social issue - and that was down to changes in how mortgage affordability was calculated in order to 'free up' alot more buying power and help a rise in house prices. Previously ONLY the man's income was taken into account when applying for mortgages, because even if a woman worked, it was viewed best not to count her earnings because if she had children, she would stay at home and look after them, and that would make it difficult to pay. Plus the multipler for wages-mortgage was lower.
T be honest, up until relatively recently in the grand scheme of things, most people didnt own their homes - rents were longterm and controlled by fair rents, and it just wasnt considered that home ownership was for the general population - plus post war there was a massive social housing building project - My grandparents bought their first home - when they were about 50 years old, in the early 60's, and that was considered pretty unusual.
When my parents bought it was only ever my father's income that was used to but a home, and prices were much much cheaper, because the multipliers were low, and wages were low. But once property started to be viewed as both aspirational, and a way for banks to make more money, and as an investment for buyers rather than simply a home, those multipliers started to increase.
In the late 80s, just before the FIRST property crash (when I bought and subsequently lost the only house Ive ever owned) they were beginning to use a second income - so I believe it was 4 x partners income, plus 1 x my income
Later they combined incomes for the multipliers - this allowed house prices to increase further
When both incomes became involved it meant both people needed to continue working - it made no allowance for someone taking time out to look after kids, and so the trap was lain