You're assuming a definition of "crisis". 2/3 of households own their own homes, and a big chunk of those that don't aren't looking to buy in any circumstances. As much as we hear about the high cost of housing, it's only an issue for an extremely vocal minority. That's not to say I don't view it as a problem (clearly it is) but I'm skeptical it's going to win any political battles.
1. "Household" is not the right unit of analysis, since a household is defined as the set of people in an existing home. Some of these include adults who would like to move out, creating a new household not accounted for in your denominator.
2. According to the U.S. Census Bureau, the average American moves approximately 11.7 times throughout their lifetime. In other words, current homeowners generate demand for housing just as non-homeowners do.
If I lost my job and was unable to find something reasonable in my relatively non-existent local job market, I would be looking to move to somewhere with a larger employer base and barely be able to make a down payment on entry level housing.