> Find clever people, and have them strain themselves to stand up a system so complex that you not only need to keep paying GS to show up and maintain it, but in fact you probably need to hire two more people just to keep the wheels on.

AS/400 can still be found in the checkout line at Costco. I don't think it is the main POS system but is used for things like looking up customer information. IIRC Oracle is taking a lot of that retailer backend business now.