But we're also talking about the enterprise space. These are people who are more than likely on the computer all the time. When they got Office 2010, they complained about the new ribbon for 10 minutes until they started to get used to it. I think we're overestimating the "nightmare scenario". Now pushing 200 people from PC to Macs, or vice versa, that would be a nightmare" support analogy.
All I know is my 12 year old put Windows 8 on his own laptop by himself and was flying around doing crazy things on it. I think the upgrade headaches for enterprise workspaces is less of a worry and learning curve than we think.