Re: One of my favourite films.
"I was just thinking we pretty much have the tech in Star Wars where Luke Skywalker gets a prosthetic hand after Darth Vader cuts the original off. "
Although I agree with most of your post, it's well worth remembering that most SF postulates many advances, only a few of which appear to come true in the readers/viewers lifetime. They are the bits we remember, so we feel as if SF is predicting the future. Some authors are a little better than others, usually those with their fingers on the pulse of current R&D, but most of the "predictions" in SF either have not come true at all (yet!) or have happened in ways the author could not conceive of. Not forgetting all the incredible actual technological advances we have seen in the last decades that every SF author missed completely :-)