Depending on how the market goes we may see some of the dumping that has been going on in other parts of the country.
In parts of country where values have really flipped, people in your situation are starting to use the good credit they have to buy a second house at the much lower current prices. They then move into the new house, stop paying on the old house, and default on the house with the upside down loan.
It ruins their credit for a while, but as long as they stay current on the new house, they are much more secure than they were in the over priced property.
I'm not saying I support dumping the loans, but the banks were all happy when they were raking in the dough, and they accepted the crazily inflated, comp only appraisals.