Re: Windows 10 = Windows 8.10
I don't disagree with much of what you're saying, but I feel one important point is getting lost in the shuffle: businesses don't buy OSes for the sake of buying OSes, they get them so the computer can be used to run applications that meet some business need.
And the 800 pound gorilla in that room is MS Office/MS Outlook. Any story that wishes to be a prediction of how future Windows will fare will have to account for the future of those apps.
Specifically: Does Microsoft still have the leverage to force Windows upgrades through restricted MS Office/MS Outlook compatibility? They used to in the past. I'm unsure whether they still have it, but I'm pretty sure that whether or not they have that leverage is the crucial question in the Windows Upgrade Circus.