True. Most of this site's visitors probably live in the US or maybe Western Europe. Extrapolating what they see around them to the rest of the world is silly. I for instance live in a country where the exact opposite conclusions can be made at least compared to a lot of posts in this thread: OSX? Non-existant, probably more so than Desktop linux installations. Chromebooks? No one has seen them. Windows Phone? Doing fine and is second in sales after Android. Apple's iOS? Sometimes can be spotted in the wild, but it's not popular at all.
I actually live in India. My generation sometimes doesn't even own computers, so much so that the biggest local e-commerce retailer is shutting down its desktop website.