I don't think movies are good for much else than entertainment,

You raise an important question that applies to fiction in general.

But consider that EY's inspiration for AI came from science fiction novels. I was greatly inspired by HPMOR and I wonder if studying science for the equivalent amount of time would have been better. Truth is that even what you study in books fades away, either because you forget much of it or because the excitement also wears off after a while. You could argue that fiction has an advantage because it is much easier to remember stories/characters than raw science.