If Rosling read this he would chide you for using the term "Western World" just like that, with at best an assumed definition. It is one of his pet peeves to stress that the world is no longer divided into the Developing world and The West.
He mentioned that the huge economic gulf has turned into a gentle slope, but there's certainly still a cultural definition of "the west".
Yes, I was absolutely referring to the cultural West (which I'd guess is the population in which he and the rest of the GapMinder project will continue to find this bias) rather than the socioeconomic West.