But in other ways science fiction has been a reasonable barometer of things.
Jules Verne landed us on the moon way back in 1865. Mark Twain logged on to the internet in 1904. Captain Kirk's Enterprise crew had cellphones in the 60s. Science fiction used to spark our imagination.
Hands up if you wished you were Jodie Foster in Contact or Richard Dreyfuss in Close Encounters, and got to meet an alien race?
Or wished you had a holodeck as your entertainment centre or lived aboard a starship exploring the galaxy?
Now all we have is guns.
Folk will always want to zap zombies and defeat the evil empire - after all, it's a lot of fun.
But so was befriending new civilisations with Star Trek's Jean-Luc Picard, examining thorny issues and holding up a mirror to our own society.
If life imitates art, let's hope there's an invincible mode.