Care to share how this tidbit is true?
Sorry to use your words against you, but I'm not so certain. I'd like to see real statistics from a few sources. I agree that Windows 7 is surely phasing out, but anecdotally (which is where most conjecture like yours and mine come from), I know a number of people who specifically stayed on Windows 7 for two reasons: 1) Compatibility with games; and 2) No telemetry (or at least it's considerably minimal compared to Windows 10).
I expect the number of Windows 10 players to increase as DX 12 becomes a common requirement, but we're not quite there yet.
I would say 60+% qualifies as most. On the other hand, ~25% is not negligible. So you both win ?