I think their parents got mortgages which they were paying off all their factory drone lives, not bought these houses.
Today you can’t even buy a house with 2 salaries. If you are living on one salary you will be struggling and will not be credit worthy. The banks assumes a life-standard to uphold which not everyone can cope with. Even if you can live with less the bank follow it's idea of life-standard.
(Or at current interest rates let out the old place)
Just walk away from the property and there you go. The worse the collapse the easier that is.