Of course, that assumes that autism should be considered a mental disorder. Many of those on the autism spectrum don't, whereas most of those with depression or high levels of anxiety do consider their condition to be a disorder. It looks a lot to me like status quo bias: if being more intelligent will cause our minds to become qualitatively different then we shouldn't try to be more intelligent.
Then again, defining disorders by self-reporting isn't that much more accurate than going with "any mental condition considered weird by the society".
Just thought you guys should know about this. Some work that argues that humans should not enhance their intelligence with technology, and that super intelligence probably never evolves.