80% of OS sales are OEM, so with the fragmentation of the OS market in 2012 (tablet and smartphone web browsing were not present when Vista was launched), it' not really a surprise that Windows 8 uptake is slower than Vista. Even Apple desktop sales are declining, as are Windows deskstop sales.
Mobile devices now account for 12% of internet browsing, a trend, not a blip. That's the future, and where MS is with Windows 8. The real failure is a software company not having any presence in the mobile space, which is where MS was with Windows 7.
Logic requires one to deal with decisions that one's ego will not permit.
All that is necessary for the triumph of evil is that good men do nothing - Edmund Burke.