Of course, the reason more people are finding it difficult to pay their mortgages is because their wages and salary are continuing to drop. In 1973, the median male weekly wage was $486.10. Source: The State of Working America by Lawrence R. Mishel, David M. Frankel, p. 78. Corrected for inflation, that is $2,361.45 in 2009 dollars, or $122,795.40 annually. In its report entitled "USUAL WEEKLY EARNINGS OF WAGE AND SALARY WORKERS: SECOND QUARTER 2009", the BLS reported the median male weekly wage is now $815, or $42,380 annually.
So, that's what immigration, offshoring, and women's rights have accomplished for the country, a two-thirds reduction in male wages. Inexpensive debt has hitherto concealed some of the ramifications of that collapse in real wages for a while, but as the chart shows, it can't do it forever.