My guess is that this 30% increase aren't more of the stereotypical autistics who are unable to care for themselves, it's identifying people who would benefit from behavioral therapy. Thus, as we better understand and better understand how to help those with it, your statistic will become less and less true. With respect to individuals who lead a very difficult life due family members or friends who have severe autism, autism itself isn't tragic, certain cases of autism are tragic. My condolences if you know someone who has a tragic case of autism. It is not my intent to exacerbate your pain.
The autistic spectrum is wide and the irony of these diagnoses from physicians is that many of the most skilled and respected physicians are high-functioning autistics. If I ever have someone doing a thoracotomy on me to repair my hemorrhaging aorta, I don't want my cardiothoracic surgeon to have a kind, bubbly, empathetic personality. I want a detail-oriented freak who understands his craft so intricately that he can save my life with nothing but unimaginable focus. The sharpness of his mind and the dullness of his personality can actually be, in fact, a benefit in many cases.