Windows 10 Just to be Windows?
Last week at a the Microsoft Ignite conference there was more talk that the upcoming Windows 10 (due this summer) would be the last Windows. This doesn't mean there won't be any more Windows, but that Windows will be continuously updated and improved instead of the current practice of releasing a new Windows every three years. With this policy change there will no longer be a need for a numbering system - it will just be Windows.
Another reason for a naming change like this would be that Windows 10 is not just for computers. The same software will also run on Smartphones, tablets, and Microsoft's Xbox so there would be no reason to have to differentiate between Windows for PC, Windows for phone, etc.
I'm looking forward to the day when I no longer have to ask "Which version of Windows are you using?" and everything and everyone one is just on Windows.