I didn't read the article yet and this is basically what I expected. Hardly a secret, and a fairly good summary. The economy is going to downturn anyway because people just can't afford the new housing. For a two bedroom anywhere with people, it's 650,000 and up. At that point you have to be married to someone who also works full time to have any reasonable chance of being able to afford the mortgage. At the average interest rate of 6% you're paying $4,100 per month, which is about the average pre-tax income (~$54,000 per year, so ~$1038 per week). Of course, that leaves very little wiggle room to save, and if either of you were to lose your jobs or the interest rate goes up, you'd probably default.
EDIT: I forgot to add the point. It's this. A whole bunch of people are going to default. People take bad mortgages because they have to, it's not like its an option to be homeless and sharing a house with strangers can really, really suck. But those people are going to be defaulting, or moving overseas, or just staying at home with their parents. The market will correct itself.