Here's the proof:
NOT IN DEMAND!
See. The surburban Best Buy I frequent was completely sold out of PlayStation 3's. None to be had. The 360? The employees were making forts out of them and slinging memory sticks at each other. Honest to Megatron.
OK, OK, so obviously I'm not really saying this means anything. I just wanted to point out how foolish the "shelf theory" was to begin with. For all I know the Best Buy stopped ordering PS3's because nobody wanted them. Heck, gnomes might have made off with them.
Point being - it was a lousy measure of demand to begin with. It remains such.