“the smart people already know this and stupid people will just ignore the sign”
That’s true to some extent. A smart coworker (a relocated new hire) was about to buy a house, and I tried to talk to him out of it. He didn’t seem too convinced. The next time I talked to him, he had decided to wait until the fall (this was late Spring 06). But shortly after that, he did some more research and became convinced that it would be really dumb to buy before 2008; so he signed a 2-year lease for a nice, big house.
My point is that some people are smart enough to “get it,” but may need some encouragement to get them thinking and researching about this falling market.