My son is 7 and he has high functioning autism. He is receiving a lot of services right now and my goal is for him to go to college and to be able to develop a career that has something to do with what interests him most in the world -- animals. I am already talking to him about various careers like being a marine biologist, zoo keeper, veterinarian, animal behaviorist. He's in general ed 2nd grade right now and does receive special ed support. He's not a straight A student but he's working at or above grade level and I am expecting more of the same from him in the years to come.
I do expect him to be independent one day. Right now, I am giving him all of the support he needs to help him learn the skills that he needs to be able to hold his own with his peers and in school (social skills training, tutoring, speech and occupational therapy) to prepare him for his future. What we are doing is teaching him in a way that is meaningful and motivating for him.
There have been so many people over the years who have felt it was their duty to tell me what my son can't do. Thank God I haven't listen to them. If I had, he'd probably stuck in a self-contained classroom, not talking and stimming with his plastic animals. He's surpassed all of their expectations but certainly not mine.
Always remember, "Shoot for the moon. Even if you miss it you will land among the stars." (Les Brown) Don't let anyone tell you what your child can or cannot do. They have no way of knowing what your son is capable of and we, as a society, are only just beginning to learn that we have done a big disservice to all of the ASD kids in the past who were automatically institutionalized when they received the diagnosis.
When you get a chance, I highly suggest reading Temple Grandin's books, Emergence and Thinking in Pictures. Both are very insightful and will give you hope for you son's future.
Blessings to you and your son.