Rationality will prevail eventually: We'll get back to 3x annual income for the simple reason that the fake appreciation due to easy loans is history.
The thing I fear though is the in-between period. Many folks will hold on thinking that the downturn is "temporary", so prices will stay elevated for a few extra years. As a consequence, you'll see doubling-up and tripling-up in housing that normally would have held only one family.
He's saying that half a million is too much for a merely 'nice' home.
But this is just a linguistic conceit on the part of home buyers.
There are mansions (homes that you can't afford), nice homes (homes that you can afford, and are in good condition/areas), and there are slums (homes you can afford, and in bad conditions/areas).
No one wants to live in a slum. No one can afford a mansion. So a 'nice' home is the only realistic choice.
Looking at the real estate listings for my area, the most expensive home for sale is $1M; and it is a beautiful mansion. I couldn't imagine paying $1M for just a nice home.
Looking at my area, the cheapest house I'd actually consider buying in an area I'd actually want to live, is north of $600K. House prices having nothing to do with the building, and everything to do with the location. It's (relatively) easy to make an ugly house beautiful.