Are you sure it's *not* Gamestop's fault? Sony has certainly blundered a lot this year, but EB/GS has turned into a very nasty little retailer lately and this seems consistent with my experience with them.
For example, every time I go into an EB/GS store around lunchtime on a Tuesday (release day for new games), the salesnerd has yet to open his shipment for the day. After he pauses his video game or stops gossiping with his friends, he recommends that I preorder next time.
Give them an interest-free loan on a readily-available item? No thanks!
I walk across the street to Toys R Us and buy it off the shelf, often for $5 less. It's sad when a crappy box store like TRU beats out a specialty shop in terms of service and early availability.
I understand that hardware is always scarce at launch, and the retailers don't make any profits from selling it, but if you're going to sell games, it seems to me you should take an interest in your customer's needs. If I were burned by EB/GS in this way after giving them a pre-order for PS3, I would resolve never to shop there again.