This tongue-in-cheek solution for reviving housing sounds as likely as any of the other schemes out there:

Now that we have a new (and improved) tax credit of $6500 rolling through Congress to the "move up" buyers we’ll see if government can incentivize that class to start daytrading homes as well.  The only issue is so many of them are underwater on their homes, it is sort of difficult to buy a new house (even with government handing free money out) when you still have to deal with that unfortunate investment you made in your old one.  

Unless, a new national fraud is institutionalized – that is (1) buy the new house with the taxpayer’s money & "super cool FHA mortgages", and (2) then walk away from the old house / mortgage, once the new one is secured.  You take a hit on your credit report but oh well – you have a new house, at a much cheaper price, and the taxpayer can deal with the mess.  In about 5 years you are good to go as the default moves to the bottom of your credit report, and within 7 years…. all gone.  Let’s see if we start hearing of rampant examples of this "strategy" by next spring.

It’s unlikely that a $6,500 credit for the move-up crowd will have the impact that the $8,000 did for the first time buyers.  $8,000 off of a starter home is more exciting than $6,500 off of a more expensive one.  That fact that it’s a poor idea though is unlikely to discourage Congress from doing it.