As for science fiction, it is said on the internet searches, that ancient myths, like The Epic of Gilgamesh, were in the classification of "science" fiction; though I look to the more recent evidences of such notions.
The earliest modern science fiction is said to be the story of Frankenstein, by Mary Shelly in 1818. Obviously, Jules Verne comes to mind as an early author of science fiction. Yet, Wikipedia claims that the ancient Hindu collection of stories include flying machines and even a feature of time travel; the difference of time between the time spent in a spacecraft of the Gods and the slower time of the Earth, from the book "Mahabharata".
The Greek, Aristophanes, has several voyages of space travel (actually "air" travel), to other worlds. Even the Bible has fantastic voyages and episodes of departures of key figures into the "Heavens". Lucian's satire "True History" has outer space and alien lifeforms introduced into the, then, current culture. It is suggested that this book is the earliest version of the SciFi genre. Some, like Bryan Reardon, says that there is no "science" in Lucian's story.
The point I'm making is that SciFi is the ultimate output of fantastic tales that often influence the culture in which it is found. Today, we have 100's of SciFi notions of just about every conceivable nature of fictional tales anout plausible "science" oriented depictions.
It is this plethora of a cornucopia of newest ideas that encompass the modern world. There is so much SciFi that some fictional documents have elements of SciFi in it's context. Even some supposedly "everyday" fictional literature may also include special events that border on SciFi ground. Missing time, abductions, disappearances, freak accidents, strange phenomena, lost places (or civilizations or some discoveries of maps and artifacts) are commonplace story lines.
There is so much science fiction that I dare say that the common human imagination includes just about ANY peculiar attribute that contains a SciFi element. It is amazing where the current mind of Humanity is going to. "The sky is the limit", which also implies that even more SciFi is coming to us all. This phenomenon is a precursor to, perhaps, another "field of dreams". Our culture is propelling us to explore much more about our Universe. We have become so accustomed to SciFi that it seems like "everyday" life to us.
It is a grand play of human imagination and no avenue of thought is denied.
So it is a possible precursor to greater civilization yet to come. That's the only assessment of the SciFi influence upon the world at large. Humanity is stretching It's imagination muscles in this time in history. What else could it mean?