Many of those people live in their same homes, the city grew up around them. At risk of making a generalization, too many young people feel they should get to start at the top. People who bought homes in the 70s spent a lifetime accumulating their wealth, many of them have supported two generations of children and are still working to support the next generation. It is much easier to just throw up your hands and cry out "The World is Unfair". A choice is made to just give up rather put in the hard work required to succeed, that choice is about to go away along with the opportunities that todays youth have squandered.
Hard times are right around the corner, the good news is that housing prices are going to come down. The bad news is it won't make a difference to the people complaining about not being able to afford them as the cost/wage ratio means nothing when You don't have a job.