I feel like all these utopian ideas fail to take into account that uh, autism takes a lot of different forms and some of them ask for completely opposite things.
Some autistic people have a...laissez-faire approach to hygiene, some are neurotic about being clean. Some stim, others would rather commit murder than hear that goddamn toy go "clicky clack" one more fucking time. Some are hyperempathetic with no sense of personal space, others have low empathy and just want to be left the fuck alone. And that's before you start considering comobidities - I think most people with ADHD would rather die than eat deliberately understimilating "autism cusine"
I feel like most people here are answering "what would it look like if everyone was your specific brand of autism?" not "what would it look like if most people were autistic?"
I'd say either we end up with everyone forming tight cliches (not good for a greater society) or one group overpowers the rest and enforces their "lack of social skills" as the new social norm. Now it's "don't look directly at people" and "be as blunt as possible" and "chili is banned forever"