My own comment is that science fiction is unique among genres in that we are all of us growing into it. Few of us will go on to a life as a cowboy, or a hard-boiled detective, or even, unfortunately, a grand romance.
But all of us are living in a world where the future is increasingly poaching on the lands of the present. Science fiction gets its power, some of it, from its views of the future, but its hidden purpose is to prepare us for the accelerating present, and to help us make some ragged peace with that. – CMR