It's possible that housing prices are much higher for good, because real estate was historically undervalued.
I know, I know, hear me out ;)
I remember reading an article during the housing boom that made a very interesting argument in defense of the high prices. It was wrong, of course, but it was different from the usual "there's never been a better time to buy... or sell!" crap you heard from the real estate PR machine. It was a pretty sober look at the numbers.
The argument boiled down to this - if you're going to compare current prices to the historical trend, you need to exclude the possibility that real estate was undervalued before you can conclude that current values are overvalued purely based on divergence from historical trends.
The paper argued that housing was historically undervalued because creditworthy people didn't have good access to credit. A house required a 20% down payment, and banks (back when banks held a loan for the entire life of the loan) wouldn't allow income to debt ratios to exceed a certain threshold. They argued that new methods to spread risk across larger pools allowed the extension of larger amounts of credit without a huge jump in risk.
An example was a loan made to two nurses with excellent credit earning a combined income of well over $200k, but who only had about 20K in down payment. In the past, this 10K would have limited their purchase price to 100K. Now, they could bid much higher - without, as the article described, a massive increase in risk to the lender, especially if that risk could be spread.
It was a well-reasoned argument, and I think what it missed was the profound level of corruption and dishonesty going on in the industry at the time. As we all know now, and as our wise leaders like Greenspan should and could have learned while they were reassuring everyone things were just peachy, is that the "two nurses" example was not at all typical of these "higher risk" loans, and the "spreading of risk" was in fact a way of dividing up and obscuring risk to make horrendous loans look better (and package them up and sell them, and then bet against them).
But this phenomenon will probably continue. Yes, housing prices are higher, but I suspect that once the dust settles, some of these "innovations" (my disgust with the industry makes it hard to use that word) may actually come into play.
In short, we may pay more for houses than our elders did, but we may actually have better, more efficient access to credit in the long run (I want to make sure nobody thinks I'm defending the antics of the banking sector during the bubble with this argument).
Oh lastly - I do apologize for no cite. Can't really remember where I read this...