eric76 wrote:
In evolution, those traits that are selected are those that increase your probability of reproducing. As far as I can see, Autism and Aspergers decrease that probability rather than increase it.
This.
Mutations happen, and those that increase the chance of reproduction stay, those that don't die out. That's natural selection. Autism is a mutation, but since we are less likely to reproduce, we'll continue as a population within the species, until we die out. Even if every one of us bred, it would take generations of breeding amongst autistics and only autistics to lead to a separate species.
Also, there's what I call the "X-men fallacy." There is no "next step in human evolution". Evolution doesn't work in steps. It's a gradual, constant preference for certain traits, not a population appearing out of nowhere. For a sudden "burst" of evolution, you'd need something like a population separated into two different habitats. As time goes on, one group will adapt to its habitat, and the other will adapt to theirs.