Even then there’s no warehouses filled with computers. Dell and HP makes most of their machines to order and they use ‘just in time’ manufacturing techniques to save on warehousing costs.
All of this means that Dell is sticking with Windows 7 because it is a better OS than Windows 8 for most users (I agree), not that they’re married to it because they invested in a bunch of stuff they need to sell off.
Think outside the box.
The poster is referring to the OS, which is not subject to "Just in time" limitations. The arrangement between Dell and MS might not have limited the total number of OEM Win7 OSs Dell could install.