Debtor's Dilemma

With the value of most home mortgages being greater the actual value of their homes, homeowners are deciding on an option to stick with the mortgage payments, or declare a foreclosure. Could mortgages be linked to unemployment? The continual decrease in value of homes and their mortgage holding a higher value then their home is related to homeowners inability to move. Homeowners often move due to job opportunities that have become available. With their inability to move, this affects their ability to choice. Would declaring a foreclosure have more benefits then the long-term costs?