It has almost gone unnoticed in the media, but since the credit crisis began in early 2007 the US government has gradually become the primary underwriter of all mortgages. The only mortgage securities investors are interested in are those from Governmental Special Entities (e.g. Fannie Mae, Freddie Mac, FHA), with the comfort that they are backed by the government. Most banks have been greatly reducing the number of loans they keep on their books, and have largely been sticking to conforming GSE products that can be re-sold.
Now that the possibility of an official government re-capitalization of the GSEs is a real possibility, it looks as if the American tax-payer is about to become the mortgage lender of both first and last resort.
I am sure that the private sector would be happy to still underwrite mortgages, but the tax-payers will offer far better deals to borrowers than pound of flesh the capitalist system would demand these days. Why take a private mortgage with a 9% interest rate requiring 30% down when you can get an FHA or GSE conforming loan at far better terms?
In short, since it is the policy of the government to ensure that mortgage financing is loose and affordable, they will squeeze out the private sector. The long-suffering tax-payer will just pick up the tab.
It's a brave new world. Private finance has virtually ceased to exist, the government (and tax-payer) has become the de-facto bank of the nation.