TwoSeven: I think if one views things from the enthusiast market point of view, having a Windows professional license for many would mean having the control over the OS that allows them to turn things on an off as required, so the idea of not being able to probably is a cause for concern for them.
On the other side of the coin, if the Enterprise E3 license contains all of the features in the professional version and allows one to have the required control, then I can see a few people switching to that if it is available as a one-off purchase rather than subscription based (although the subscription options are quite interesting).
Update: I have not done a feature comparison between the two versions, so I am not sure what is different from that point of view.
E3 is ~US$7/month/per-user and each user can install on 5 devices.
