Of course /. is going to say 'it's not scientifically proven!' but plenty of things make absolute sense. I am an aspie, not self-diagnosed... hit every single one of the diagnosis criteria hard, and I couldn't be more proud of being HFA (Highly Functioning Autistic). So many people look at Aspergers or Autism as a very negative thing because it is different. There are NT (Neurotypical) and ND (Neurodiverse) people that do just fine functioning in society, or with each other in relationships. There also are those (you can call them Simon Baron-Cohen hits the nail on the head with Empathizing/Systemizing Theory of Mind, and this Assortative Mating is only the next logical step in explaining how Autism progresses from generation to generation. The science already proves that there are genetic precursors to Autism spectrum disorders, so it isn't really a stretch at all to say the parents aren't subconsciously on the spectrum and attracted to someone else who is.
I am only really into girls on the spectrum who are hyper intelligent and 'nerdy' which in a lot of ways is all being an aspie is, socially awkward and overly intelligent. Believe it or not, most of /. userbase is somewhere on the spectrum, and many of the people who you associate with are as well. In my personal opinion, a good 70% of those I associate with and 10% of people I encounter display the traits, and the law of attraction be it romantic or otherwise means that like mixes with like. Almost all of my friends are aspies whether they know/admit/care or not, and of course people will just scream 'overdiagnosis' because statistically diagnoses have jumped. That is because we are only finally starting to scratch the surface of these 'disorders' and starting to realize that comorbid/cooccurring disorders correlate to causes. Psychology as a whole has only been around about a hundred years, so it is no surprise the field is rapidly developing quicker than the research can keep up.