This is nothing new. It is a rehash of an FHA plan that lets people who can't really afford houses to get in them with a so-called "silent second". You would still have to get the bond holders to agree to put off their money for 10 years with no assurance that they will benefit. Also, why should the people who bought these homes and refinanced them over and over, collecting and spending hundreds of thousands of dollars in some cases and then spending it, be bailed out and able to live in a house that they cannot afford due to their own greed and negligence?
In addition, wouldn't the home prices on the particular mortgages still reflect inflated prices? Being able to make the payments doesn't necessarily mean that the home had any actual equity, thereby keeping the investment risky.