@Sean Dawson there are a number of reasons why people who theoretically could buy a house wouldn't, and they are a large and growing part of the population of homeowning aged people in the US.
Let's start with the 7.3M who lost their home between 2007 and 2014 (and counting, by some estimates to 9M+ before it's all over). Even though the foreclosure or short sale is disappearing off their credit reports for the first wave of victims, how many are that excited about jumping back in?
Then there are the kids of those unfortunate former homeowners who watched their parents go through the hell of losing the roof over their children's heads. These are the millennials who did the thing a lot of people do in a recession which is go to school (it's way more fun to be a broke student in a school full of broke students than a broke adult with no job). Unfortunately they financed their education with debt that can't be discharged even in a bankruptcy and many if not most can't find full time work in their chosen fields.
Plus to add insult to injury, what ever they do manage to save for a down payment earns zip thanks to the Fed's ZIRP (that the Fed find themselves trapped in). But it's not only the kids; grandma and grandpa, mom and dad are also earning squat on their savings so they can't help with the downpayment either.
And then there's the 56% of existing starter homeowners with a mortgage who can't afford to sell their house and net enough to buy another of the same price let alone move up (http://ashworthpartners.com/46-of-us-homeowners-with-a-mortgage-are-frozen-and-cant-afford-to-move/ ) making it difficult for those who do accumulate a down payment to find a starter home they can afford.
Now the NAR and their resi real estate agents, the MBA and their home mortgage bankers, the NAHB and their home builders are all saying it's just a phase and everything will go back to the 1950s just as soon as Ward & June Cleaver get their new TV show but they underestimate the power of recency bias and demographics combined.
Add on the need to stay mobile for job opportunities and it will be much longer before owning a mass produced suburban sfr is the American dream again.