Fiction may not be "needed" or "required" or other such gratuitously exclusionistic terms, but that doesn't mean it isn't valuable in spreading ideas.
The relationship between scientific progress and science fiction has long been a mutual symbiosis, with each inspiring the other. After all, science progresses through the communication of ideas, and fiction is an effective way of doing that.
Both of these points are only true and very full of proof.
As Kirk said to Decker in STAR TREK: The Motion Picture
"I stand corrected."