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Windows 7 is good enough. The problems it does have are largely fixable. People don't buy new computers just to get a new OS at this point in time and they don't feel the need to upgrade their current computer to the latest and greatest, either. The OS upgrade treadmill is running out of steam for Microsoft. They also already charge a pretty hefty fee for Windows 7 and make a lot of money doing so. Instead of trying to make a new OS every two years and fragmenting their user base they should focus on refining what they already have as they'll still make a boatload of money off it and they won't drive users away with change they don't want.

Cheers,
-WW