Evolution is triggered by 3 main factors:
Survival, Reproduction, and care of the offspring.
Autism doesn't grant a noticeable advantage in any of these categories. Extreme specialization allows us to "earn our keep" in society, but there's a difference between being a contributing member of society and being the next stage of human evolution.
I do however believe that intellect will slowly take preference over physical strength. In the future humans will be more intelligent, but not physically stronger since we can get all the muscle we need from machines.
The transformation will start culturally long before it ever shows up in our genes, at first geek culture will go fully mainstream (this is already starting), then as technology progresses and takes over more and more physical labor there simply won't be an economic need for strong people, what physical jobs remain will be operated either by robots or by humans in exoskeletons (think Iron Man suits, but for a noncombat application). Then slowly but surely the cultural need for strong people, such as athletes, will fade due to the complete saturation of geek culture. Once this occurs then humans will slowly grow weaker, but much more intelligent. This will take a VERY long time to happen of course, I don't predict the cultural changes to be complete before the end of this century and the evolutionary changes won't be noticeable for a few thousand years.
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The improbable goal: Fear nothing, hate nothing, and let nothing anger you.