To be honest, this doesn't surprise me in the least.
Remember, many large enterprises are just now settling in on fresh Windows 7 rollouts. The same is true for home users as many home users have the same thing at home they use at work.
It is unrealistic to expect anyone but the enthusiast to upgrade so quickly. My company still have 7 Windows XP machines laying around that I hope to replace in the next few months - with Windows 7 - since that is what I have testing our environment against.
On the other hand, Windows Server 2012 adoption is going quite well thanks to the drastic improvements in virtualization and licensing.
JamesNT
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