When did the media newscasters first start calling the US real estate market of the past 10 years a "bubble"?

I was just wondering whether there is a shred of credibility in the claims of the Wall Street geniuses that “They just didn’t realize that nothing goes up forever.” Isn’t it more likely that they knew that perfectly well, but that they also understood the concept of “Too big to fail”? Didn’t they know that the taxpayers would be left with the Hoboson’s choice of either bailing them out or living through a second Great Depression? Isn’t it possible that a group of multi-billionaires arranged to set up a fire sale where they could grab property and businesses at a dime on the dollar, then reinflate the market to cash in on their larceny?

I’m not a conspiracy theorist, and I can’t name who may or may not be behind such a conspiracy. But I do recall newscasters speaking of the bubble in housing prices long before the bottom fell out. It’s pretty hard to believe that the media and most of the general public knew there was a bubble inflating, but the geniuses of Wall Street and international finance were utterly oblivious to that fact. So if we have to go get a rope, whom do we hang?