then draw a wild conclusion that people are using it to get Windows 10?!
I recently helped a local nonprofit upgrade to Win7 for exactly that reason.
Yes, I can think of plenty of other reasons for people to pick up a Win7 license (as the most obvious, "I just got a new laptop with Win8, help!"), but the average retail customer will realistically just use whatever the computer comes with, and keep it for the life of the machine.
If, therefore, we see an uptick in sales of an OS you can't even easily get on a new machine anymore (yes, we geeks can still get it, but Granny, not so much) - That means something.