Do we want to trade crazy high prices in the American real estate market for absolutely crazier high prices in the Australian real estate market?
That is a bit simplistic though, there could be other things going on in Australia, and all the other rich countries (e.g. Switzerland, England, China) where American prices look like a good value. I'm sure at the end of the day supply is the main factor, and not having a hot economy also helps, so I'm sure the USA will get there fairly quickly.