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Windows is not going away any time soon. Windows Phone 8 is not that big of deal right now but it is growing. The thing about Windows Phone 8 is that it works very well with other Microsoft software like Microsoft Exchange and Microsoft Office. Many AutoCAD users use many Microsoft Products (like Office and Exchange.) Windows Phone 8 will get adopted, how much, I have no idea. In the U.S. it only has a small market share (at the moment) but it is growing. Windows 8 will eventually replace most of Windows XP, Windows Vista and eventually Windows 7. Honestly that may not happen until Windows 9 comes out, but you get the idea. Windows, for the moment, is here to stay in the enterprise and in small business.