Also, why don't the future societies in sf indulge in their own science fiction? Says Dave:
Perhaps the universe will one day become predictable enough — perhaps scientific change and progress will be so much a part of us — that looking into the future will just be an exercise of more-of-the-same. I’m not saying we’re there yet, but we might be approaching it. Maybe we’ll have so much of an understanding of the workings of the world that we can’t write anything but what we term the fantastic. In other words, the impossible, the fanciful, the mythic that has no pretension to reality other than a metaphoric one.