This idea is brought up quite frequently. There's a lot of really idealistic views of what it would be like. Personally, I think they're all misplaced.
I don't think it would anywhere near as rosy as many think it would be. All you have to do is stick around this forum and read a LOT, and you'll get a pretty good idea why I feel this way.
Autism IS a disability. A disability defined by impairment of communicative and social skills. Fill the world with people who can't communicate well, don't care for socializing, and what you really think will happen?
Frankly, as a group, we are not equipped to run things. If we were in the majority, we AND NT's would all be screwed.
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I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...