I helped a friend with Win 8 printing problems, and I was initially lost. It took me 5 times longer to resolve their problem than if they had Win 7. (Or Vista. Or XP. Or 2000.)
I plan to use Win 7 until it's EOL. I would like to say I'll dump Microsoft and move to another OS, but the truth is I use a lot of Windows software and will therefore be lumped with Microsoft operating systems for many years to come. For this reason, I resent Microsoft and their atrocious UI decisions of the past few years.
Microsoft is obviously feeling the heat from Apple, but in trying to force a touch UI upon everyone (even those with non-touch devices) they are also annoying a heck of a lot of other people. Some of those may even think: if I'll need to re-learn the interface, I may as well take the opportunity and move to another OS. (Ironically, most likely Apple.)
I hope Microsoft does hemorrhage customers, and learn how to refine their UI without drastically impacting on people's productivity. And with all the flip-flopping Microsoft has done over the past decade, I wouldn't be surprised if they do.