Anyone losing a job (and there are many) may not be able to make payment, and even people who CAN make the payment may have to relocate and if they are underwater, that sucks bigtime.
One foreclosed house on a street is like a bomb. There are 8838 houses going into foreclosure per day.
That is 8838 houses per day that are no longer making mortgage payments or paying property taxes.
That is 8838 houses per day that are dragging the value of the houses are them down.
Trying selling your house when the house next to yours foreclosed on.
This 2003 "boom" was due to housing. The housing bubble credit contraction is going to suck this economy down the drain with it. With it stock prices, car prices, boat prices. Anyone holding a pile of cash at the end of this cycle is going to be able to buy 3 of everything that is priced at today's prices.