If you are in so deep that you can't possibly pay back your debts, then declare bankruptcy and get a fresh start. But realistically the banks need to stop these strategic defaults or at least need to change the perception that walking away from a mortgage has no consequences other than hurting your credit rating. Currently the choice for people is A. struggle to pay your mortgage, or B. stop paying, live rent free for a 18 months and end up with a bad credit. I understand why people chose B. If B ultimately results in bankruptcy I think we will see less strategic defaults.
Next the media needs to accompany these stories with articles about how what these do to the rest of us. I'm part owner (i.e. shareholder) of a couple banks that do business in Florida so there is decent change that some of these mortgages belong to these banks. In 2009 both banks dramatically slashed dividend payment and my income got cut also.
Even if the mortgage isn't through one of my banks, it is almost certain that mortgage is owned by a bank in mutual fund or index fund,owned by myself and most everyone on the forum. However, even if you don't own any stocks, their defaults hurt the average American because the vast majority of mortgages are sold to Fannie and Freddie and when they default, the add to the tremendous losses suffered by Freddie and Fannie and ultimately gets add to our and our children's debt load.
Just once, I like to see an article where it calculated how much money the couples default was costing the rest of us.