NOT拯救华尔街 but ...

I doubt 房贷金融衍生物 has 几百万亿. Besides 房贷金融衍生物的X or low XX万亿 is nominal price. The actural price is much less.

房贷金融衍生物的XX万亿 are a very small percentage in derivative market.

There is aleays a buyer and a seller for any derivatives.Do not forget, Most of the buyers and sellers are what you defined as "Wallstreet".

I am not say the low RE is not a big problem. However, it is very serious problem and is part of the reason of QEn. Most importantly,

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It is the only legal way to relieve the huge debt and future defict of Federal and local gavenment.