what period is long term, would any part of the chart still be sitting at a time when there was only one income in most households? it might be that the shift to now is property is purchased mainly by dual income couples / families.
Median household income would presumably factor in the dual household incomes, it wouldn't change the ratio. That and the fact Australia is hardly the only place in the world with dual household incomes. Other locations have not experienced this fundamental change you're alluding to, at least I've not seen evidence to this effect.
I think the guy mentioned in the OP sounds like a pretty innocent victim, price (and thus debt level) sounds reasonable, most definitely do not think he 'had it coming'.
