Bah!
"With Windows 10, we think of the operating system as 'Windows as a service'," said Terry Myerson, Microsoft's VP of operating systems. "In next few years, you could think of Windows as one of the largest internet services on the planet. The question of 'what version are you running' will cease to make sense."
I'm guessing that this is weaselspeek for "Large protions of the Windows O/S will now download from the web on boot (providing you have a paid-up subscription) and Windows No Version Necessary will not work if you have no internet connection".
I imagine this makes sense if you consider all PC users to be gamers who have to be connected to Steam etc get their games to start, or if you live in that parallel Stupid Universe.
I see the operating system as fundamental bedrock, not "a service".
Microsoft spokesweasels have a very specific meaning in mind when they talk about services, a meaning not predicated on being the most useful to me under the least helpful circumstances, which is what I require from an OS.