Interesting and I have no idea whether additional needs would be supported/accepted in professional life as a dancer. But I do think that learning dance in a class setting is very beneficial. My daughters do not have an ASD (though they do have some autistic traits), but they are both dyspraxic and started doing gymnastics and dance as therapy for this - they had weak cores, and poor muscle tone. It has helped them enormously though they are doing it for fun and not as a potential profession . The gymnast is now strong and works well with her partners/team members. She has not made many friends there as she is very shy, but she is accepted and respected I think, and because she has to focus and work very hard, she has improved more than others who maybe don't "have" to work as hard. If that makes sense?
The dancer also has great focus, again because she has to have, and works very hard. I've never seen her give less than her all in a class, which certainly wasn't the case for me at her age when I was dancing, though dancing came far more naturally to me. Most importantly they love it, and have so far coped well with some potentially stressful situations (exams. shows, gym comps, festivals etc).
I think it would depend on the nature of the additional needs, but with the right combination of talent, luck, and application that all students need, I think it would be possible for a student to succeed professionally.