"we have not yet seen the anticipated Win10 stimulation of demand"
Um, anticipated by whom, exactly ?
Oh, right, by those who looked at every previous Windows version sales impact and blindly took the same numbers, forgetting all the while that :
1) Windows 1 0 is the first Microsoft OS to be offered as a free download (for the moment, at least)
2) The OEM image for new PCs was months late, due to MS faffing about with the code right up to the last minute
3) PC hardware no longer has anywhere near the jumps in year-on-year performance that we enjoyed pre-Y2K, meaning that a 3-year-old PC could still conceivably be used to run the new OS without much trouble
In other words, the only people "anticipating" a surge in PC sales were those who had their blinkers on and took PC sales and new Windows version as an article of faith.
The rest of the world checked GWX and either tested their PC or threw the whole damn thing out with the bathwater. No new PC involved.
Once again, a major organization demonstrates just how unconnected it is with the Real World.