It would take something like staggering fraud by the corporate mega landlords, mass evictions of everyone living in those unattainable small homes and subsequent actions by banks keeping people out of those houses, mass layoffs and unavailability of reliable automobiles to cause a similar crisis to 2008.

If all those factors came together, then we would see the US economic engine grind to a halt. The biggest worry really is a cascade event that would lead to the monopolization of many different parts of the US economy and neutering of what little federal ability is left to prevent it from happening. If it does happen, it means record profits for the new monopoly class and everybody else left to fight over ever dwindling scraps of what's left.