I've never seen a GS with more than maybe 5 consoles of each in their store at one time. Even my friend who works there has told me that they usually only get a handful. Don't know why this is news to be honest.
At any of the stores: In my area PS3's have always been in an abundance. The XBox 360 has always been overflowing. It is the Wii that has been absent from the shelves. Occasionally the shelves would fill up, but would quickly empty. And the PSP also seems to stay on the shelf. I have yet to see a PSP Go. The DSi also is something that stays on the shelf.