I have to jump in here. When my son was diagnosed with autism at age three followed by my daughter, at age 9, with aspergers a little over a year later, I was convinced that there was a significant difference between Autism and Aspergers. My daughter had no language delays and fit the diagnosis of "high functioning" aspergers to a T. My son was only a little verbal, had difficulty communicating anything beyond very basic needs, screamed, got naked, painted with poop, inflicted self harm, and so forth.
Now, at 11, after going through a remarkable play based intervention program, he too would appear to be an aspergian. He has an extremely sophisticated vocabulary, is brilliant in his own areas of interest and sounds like a little professor. Both continue to have some social difficulties - my daugher fewer, but then, she's five years older.
I no longer differentiate between autism, aspergers, high functioning, and so forth. I think that people, regardless of spectrum or not, have the ability to grow and change (see Carol Dweck's research on Mindset - and if you are into math, or education, Jo Boaler's "Mathematical Mindsets" is a great read). Our whole family of four will always be "On the Spectrum," and proudly so, but we, like all individuals, have the ability to grow beyond our starting point and to make startling changes in our capacities.
I am not making claims that a non-verbal child with autism who is completely dependent can necessarily become a fully functioning adult who is able to work and function in the world, but I refuse to rule it out.
The label Aspie might be useful in describing where we are now in our journey, but I don't think it is at all helpful in defining our capacity, or that of any individual. to grow and change.