Windows 8 has a real chance at beating iOS/Android in the enterprise, which eventually makes it a challenger at home also, and this is in large part due to the ability to run Office - and *the full Office suite* at that. Why would Microsoft want to give away this advantage in exchange for short term Office sales?
<Homer Simpson voice>Mmmmmmm.... Kool-Aid....</Homer Simpson voice>
Dinosaurs aren't extinct. They've just learned to hide in the trees.