Oh brother. In every school when there's an aide the goals is to build independence, not dependence but without the aide, and those students would still be in a self contained class without th aide. Aside from that, anyone who has a child who has a Aide/ Para knows getting it was never easy in any state 5 years ago, 10 years ago and it will still be difficult 5 years from now. Autism rates nor the DMS has nothing to do with it.
And again, even those who have a diagnosis don't always qualify for special ed per each states criteria. Those with asperger's generally do have 504's regardless of the rates and DSM. The higher the autism rates nor DMS will result in nothing unless they change state and federal educational laws.