I think it's MS that's refusing to adapt. The failure of Windows 8 has now killed Sony's PC business.
Microsoft is adapting. Them keeping the same ol' tired approach to an OS interface is a lack of adapting. We've had the same thing since, essentially, Windows 95, and even earlier in some ways.
The new update (now rumored to be delayed until April), will do much to satisfy many users. The ability to bring "Metro" apps INTO the desktop will be big.
When it comes to massive shifts with software interfaces, you can't expect a company to get it perfect right away. Not even the beloved Apple has managed that feat. There are always short-sighted approaches, bugs, shortcomings, etc. They're doing pretty damn good with rectifying most issues users have had, while maintaining their stance that the underpinnings of Windows 8 will be sticking around.
It is good and acceptable that they will be better allowing the desktop to essentially be everything for PC/non-touchscreen users. And they still get to maintain perfect compatibility between the different device classes.
It's a win win for all of us.