What's not discussed is that these cities were much smaller back then, had far fewer services both private and government, had much higher crime and pollution and a host of issues that have all been substantially ameliorated over the decades, specifically the 90s.
If people want the experience that their parents had to find cheap housing, then they have to move to a location that is in a similar state today that London or Toronto was in 30 years ago. Those places do exist and there's no shortage of affordable and cheap housing in Canada, many parts of the U.S., and I suspect the UK.
The problem is that what people my generation really want are all the benefits that have come over the past 3-4 decades without the cost of paying for those benefits, and that's just not likely to happen.