If you lose your job, and can't make the payments, that's different. You are not walking away, the bank is taking it back.
Why do you think there is the highest rate ever in foreclosures? People are walking away because they can't pay the mortgage. The author is saying that rather than cash in your 401Ks, use your credit card, and borrow from friends and neighbors to hang on to a house you may lose eventually, walk away now so you have some kind of future.
The banks are kicking people out of their houses because a deal is a deal.