As much as I wish this were true (I've been gunning for the MS downfall forever), I doubt it will be the case.
My (non-technical) girlfriend recently needed a reformat, so on a whim I installed the 8 RC to see what her reaction would be.
She loves it. It is, quite simply, the first Windows release that presents software in a friendly and usable way that allows the non-technical user to get just as much from a PC as they could from a Mac.
Difference drives the uptake of software, otherwise we'd still be on Windows 95. 8 is just as rock stable as 7, but faster, and with an interface that is more logical and easy to grasp. I see no reason why it won't be a huge success (besides some kind of major corporate-IT catastrophe).
Newell's comments are leveled at Microsoft's monopoly on software distribution for Windows RT, which may in fact cause a disruption much like the one he outlines. The consumer, however, will finally learn what the "flag button" on their keyboard is for.