Okay, so maybe "cheerleader" is too strong of a term, but haven't we heard this time and time again before?
How about April 2007? (see quote in paragraph #2): http://www.businessweek.com/the_thread/hotproperty/archives/2008/08/latest_prediction_californias_housing_market_will_hit_bottom_first.html
How about October 8, 2008?: http://www.naplesnews.com/news/2008/oct/08/economist-now-housing-market-has-hit-bottom/
How about November 15, 2008? http://www.therealestatebloggers.com/housing-general/bottom-of-real-estate-market-is-early-2009-according-to-realtor-survey/
How about February 9, 2009?: http://www.reuters.com/article/idUSTRE5140H420090205
July 2009?: http://abcnews.go.com/Business/Economy/story?id=7980968&page=1
I could go on for quite a while but I think you get my point. The people who didn't see this coming are the ones trying to convince people when it is going to end. Seems fairly simple to me. People will start buying houses again when they have jobs. And only then.