I dont think anyone here is espousing the notion of property as a risk free investment - especially now.
But Keen and 60 minutes (not surprisingly) are looking for exposure and notoriety. Their ratings are slipping and theres nothing like a great shock story.
The reality is no one knows how much property prices will fall - Keen knows that - he is more interested in a bit of a front page story. 40% is a huge number and unlikely to eventuate but no one knows for sure.