Well, I think it is much simpler when looking at the rent/buy analysis.
low demand (no one qualifying) and high supply (foreclosures, over building) = lower prices.
As prices go lower, so will the price people are paying for rentals. When the price of a rental property drops that means the PITI will go down. More and more landlords, having lower carrying costs, will be able to compete on price to get THEIR place rented in a market with a lot of rentals vacant (again, over supply).
This is a vicious cycle. Knowing that they have a lot of competition and cheap rents in the rental market (on top of high insurance costs and taxes) investors know they will need to pay less for a property to make it work. This, again, will drive down demand for the house at a certain price. This will bring you back to the beginning of the post.
What needs to happen? Supply needs to decrease and demand needs to either stay the same or increase. Until that critical point, I don't see prices stabilizing.
just my 2 cents