Well the market has already lowered prices on houses, it has already weeded out most of the bad loans, people are out of their homes they couldn't afford and people are out of jobs they abused. Once there is an upturn in the economy which could be in a year, could be sooner people will be ready to buy those houses, hell people are already ready to buy those houses to sell later and make profit on.
Government will of course regulate (too late) but what it really needs is to have and use oversight which it had the opportunity to do before the shit hit the fan (with OFEO an oversight committee created to look over Freddie Mac) but certain politicians blocked the oversight of Fannie and Freddie.
http://www.youtube.com/watch?v=YL36nwCSYUM