Okay, what he's doing is not called scripting. It's called, uh, aphasia kicking in here, uh, not echolocation, a more technical term than parroting, uh... when I think of the term I'll let you know.
And what he is doing is useful. It won't last forever, most likely. People who (do what your son is doing) usually move on to using scraps of this repeated dialog in their conversations. Since most of what we see is fairly routine, that will get him through most days. The next time you go to work, listen to the people around you and see how many repeat lines from television.
He is in a stage, and so are you. Both of you will be moving onto another stage as both of you mature more and learn more. You are still in the overfretting about the future stage.
The first year after my daughter was diagnosed, I could not think the word "ret*d" without bursting into tears. And since that was all I could think about, I cried a lot. The next few years I could not say the word "ret*d" without bursting into tears. Thirty years later it's no big whoop. I don't know why we parents have to hurt for so long first, but that seems the way it goes.
