It does pull a lot of money out of people's pockets. Even if it doesn't go back up much, it translates to a 50-to-60-cents-a-gallon gas tax. But for the borrowing that people were willing to do, it probably would have led to recession.
I wouldn't necessarily predict this would be a trigger, but I wouldn't rule it out either. It wouldn't surprise me if you see money leaving the secondary mortgage market, leading housing prices to fall.