I alway thought the standard was 3 times your income, but I think you're missing the whole point of the article. Even by that 2.5 standard a lot of people were able to purchase a house a little bit under a decade ago. The same can not be said of the situation today.
Take a look at this graph:
http://graphics8.nytimes.com/images/.../longlarge.jpg
I think the figure of 60% of houses in the year 2000 selling for $250,000 or less going down to 2% today is quite insane. It just shows how crazy the housing bubble has gotten. And it seems like it still has quite a long way to deflate:
http://graphics10.nytimes.com/images...aph2.large.gif