Science fiction creates an appetite for interstellar space exploration among certain people  Unfortunately, this appetite cannot be satisfied with any technology humanity will soon possess
Since gaps between expectations and reality spur discontent, no doubt one effect of science fiction has been to create an unproductive dissatisfaction with the way the world actually is
If the appetites science fiction has created in people could all be satisfied with technologies that humanity will soon possess, then science fiction could not create an unproductive dissatisfaction with the way the world is.