Could you imagine renting to one of these people? They'd be the stuff of landlord nightmares. You know these are use-security-and-last-month-rent-for-last-2-months'-rent people. So if there are any damages beyond normal wear and tear, good luck trying to recover a thing. And if it didn't suit them to have 30 days' or 60 days' notice from the landlord (I give at least 60), they're just the types to put the landlord through housing court hell based on the 30-day law.
I don't suppose the OP also considered little things like fluctuating electricity and NG costs, if electricity is included?
I swear, I really do believe these people think they're supposed to be able to have a home for free. I've encountered this mentality personally. It's amazing.
I don't know much about the housing market, really, but it seems to me that empty, foreclosed houses can't possibly equate with more rental units--somebody has to buy them, keep them up, and then rent them!
Now, I would expect an increase in existing foreclosures to correlate to an increase in squatters.