It's too early to call Windows 8 a failure -- or is it? From a design standpoint, the schizophrenic interface is a mess: Two interfaces -- the traditional Desktop and the new, touch-oriented Modern UI -- make navigation exceptionally frustrating, particularly for longtime Windows users. Microsoft's enterprise customers may very well shun Windows 8 and stay with the familiar (and easier-to-use) Windows 7.
Redmond's next move? One option is drop Windows 8's conjoined-UI design and offer either the Modern UI, which is quite good on its own, or the tried-and-true Desktop on future versions of Windows. If Windows 8 sales prove disappointing, Windows 9 may arrive soon that expected.