That's not the issue, really. If there were a "cure" for AS, like brain surgery, people wouldn't be making their own decisions. Society would naturally force them to do so.
Kids would, of course, be forced by their parents; and in many cases parents who disagreed might lose custody.
Adults on disability would be forced by the government, who can mandate treatment as a condition for continued disability payments.
People who had health insurance would find a prohibitively high cost, so that they could not obtain health care unless they were treated.
Prison and institution inmates and those who had been declared legally incompetent would be forced into treatment against their will.
People who had jobs could not get accommodations when treatment was available to make those accommodations unnecessary, and so would be unable to work.
Of course, thankfully this situation will never happen because we will never be able to cure autism in an adult. Even gene therapy on a fetus or at the most a neonate is at least a half century in the future; but what will happen first is that they will find a genetic test, whereupon most autistic fetuses will be aborted and most autism cure research will stop because autism will be considered "preventable" and the funding will dry up as existing autistics age and are no longer cute children.