This is interesting stuff, several considerations come to mind.
Internet access is not the only constraint. I live in the US and I've spent time in Canada, so my knowlege of other places is limited. I would guess that less than one percent of the US population knows much of anything about asperger's and not much more about autism except that they've probably seen Rainman. That means that the vast majority of aspies in the US have no idea that they're aspies. It ain't obvious like a broken leg.
I would expect that aspie awareness in much of Africa and rural Asia would be orders of magnitude lower, so I can't see any basis for even guessing how many aspies there may be in much of the world.
The "white folks" model might get some support from the fact that there's nobody at all on the map from Asia, a continent that includes a huge number of knowlegable people in all fields and an awful lot of people with internet access. Many of them speak english, so they could easily get around this website. The people of India, Pakistan and Bangladesh are Caucasians, not orientals, whatever the significance of that may be.
Canada is similar to the US in a lot of ways, with ten percent of the population, so it should have ten percent of the number of aspies, but that doesn't show up on the map. I can't explain that.
I thought Yate's topological theory was a wonderful start because he seems to be one of the few people who recognize that social isolation is the central feature that any theory of autism must explain. Without the big picture as context, I can't see much point in mechanistic random facts about grey and white brain matter and lunatic "extreme male brain" theories describing males who spend their lives at the bottom of male heirarchies getting bullied by males and ignored by females. I wish they would stop explaining long enough to tell me what it is they're trying to explain.
I think Yates arrived at the wrong answer to the right question. People in rural areas have much more to do with their neighbors than people in cities. The more physically separated people are, the stronger and closer their personal relationships become. Frontier people and ranchers depend much more on each other than people in a New York apartment building who might occasionally nod or say hello.
I remember reading about the old days in Canada's far north. It was popularly believed that Criminals from places south could hide out there because there were so few people, but the reality was that nobody could go anywhere up there without everybody around knowing about it. People there kept up with each other.
I'm not aware of any people anywhere who live as isolated families except european frontier farmer colonists in places europeans colonized in the last few centuries. This would be especially true of people moving into europe to hunt large Pleistocene mammals. I can't imagine a father and son mammoth hunt.
I don't like the idea at all, but sometimes ideas I don't like turn out to be true. Maybe the genetic basis of asperger's really is just a deleterious mutation or a complex of mutations somehow correlated enough to produce a recognizable syndrome. Maybe it's in the process of being selected out of the human gene pool. I think it's clear that aspies' reproductive output is way below average, and in the standard model of evolution, that makes it true by definition. Treasure your uniqueness, cause we're headed for extinction, one more dead end in the history of life on earth.
I don't like the idea, but it sure would fit the plain and simple facts. Please, somebody show me why it's wrong.
_________________
They murdered boys in Mississippi. They shot Medgar in the back.
Did you say that wasn't proper? Did you march out on the track?
You were quiet, just like mice. And now you say that we're not nice.
Well thank you buddy for your advice...
-Malvina