I might disagree with you. Eventually prices will always rise, but if there is going to be a correction say in NY and California's housing market, it might be best to sit back a year, let all the foreclosures come on to the market, and buy in then and save 5-10%, rather than buy now.
There will always be corrections; the issue you raise then becomes if you "save" 5-10% not if it is a good long term investment.