so expect a 2008 QE-1 style balance sheet expansion by the Fed targeting mortgage securities via OMO there will also likely be additional government policies and programs, such as increasing the scope and volume of explicit government guarantees on mortgage securities
in the US, there's been a real estate bubble in the building since 1990's (pun intended). it was about to burst/de-leverage several times, but it was refueled via QE and government guarantees among others, thus delaying it