What is the cultural significance of Ray Bradbury's work?

When Ray Bradbury died in 2012, President Barack Obama released a statement that praised Bradbury's contribution to society.  Obama specifically mentions that Bradbury had a "gift for storytelling."  

"His gift for storytelling reshaped our culture and expanded our world.  But Ray also understood that our imaginations could be used as a tool for better understanding, a vehicle for change, and an expression of our most cherished values.  There is no doubt that Ray will continue to inspire many more generations with his writing...."

That's high praise from one of the most powerful men in history, and Bradbury's cultural significance is most definitely deep and wide.  
For many readers, Bradbury could very well have been their introduction to science fiction literature.  While something like Stars Wars is probably known at a younger age, Bradbury is one of a few science fictions authors whose writing contributions can be found in literature anthologies.  He and Asimov are probably the two men who have done the most to make science fiction literature a part of the canon of literature that is taught in schools and universities. Bradbury successfully did this by embedding important topics and warnings about the future in his stories.  His stories aren't simply science fiction adventures with spaceships and lasers.  His stories may take place in imaginary locations and time periods, but their themes and messages were applicable at publication date and continue to be applicable to today's audiences as well.  That's probably one of the reasons why so many schools still use his texts in the classroom.  That kind of exposure to so many young minds in and of itself makes Bradbury and his writings culturally significant.   
There is no doubt that Bradbury was a visionary of the future.  His stories contain so many examples of things and technologies that didn't exist at the time of publication; however, they exist today.  "The Pedestrian" has a self-driving car in it.  "There Will Come Soft Rains" is about a computerized home.  It's essentially one of today's "smart homes."  It even has robotic vacuum cleaners, which even I currently have in my home.  The house has a voice that talks, asks questions, and makes choices.  It is equivalent to Amazon's Echo or the Google Home. Montag's wife fills her head with noise from her "seashells," which are eerily reminiscent of today's earbud headphones. 
While Bradbury's worlds are filled with amazing technologies that are meant to wow readers, Bradbury never allows readers to think that all of these future technologies are going to be good/wonderful/world-fixing/etc.  His stories frequently carry a warning against the "Technology as Protector and Savior" myth of American culture.  Jack Nachbar defines the myth as follows:

Technology is, by definition, that nearly all problems in the present world are solvable with new inventions.  

Part of Bradbury's cultural significance is that Bradbury's stories frequently present technology as a dichotomous subject.  Technology is both good and bad.  "There will Come Soft Rains" is a good example of this.  Technology has gotten to the point where a house is capable of waiting hand and foot on its occupants.  The house cooks, cleans, and keeps everybody on schedule.  The people are free to play outside and enjoy spending time together.  Unfortunately, the technology of nuclear weaponry killed everybody, and the house's technology was unable to protect the inhabitants.  
"The Pedestrian" carries a similar warning.   Much of society has been automated, and the humans are free to spend time enjoying things in their homes.  The main character goes on a walk and gets arrested by an automated police car for the abnormal behavior of going for a walk.  It's seen as abnormal and possibly dangerous.  Everybody else in the world doesn't do this because they are obsessed with non-stop media consumption. According to current statistics, it doesn't seem that Bradbury's story is that far off anymore. 
I feel that Obama's press release correctly identifies what is probably most significant about Bradbury's impact on culture.  Bradbury's writings were, are, and will continue to be sources of inspiration to young readers, explorers, and other storytellers.  I feel that the following quote from Steven Spielberg effectively conveys exactly how culturally significant Ray Bradbury was and still is. 

“He was my muse for the better part of my sci-fi career. He lives on through his legion of fans. In the world of science fiction and fantasy and imagination he is immortal.”
https://www.theguardian.com/books/2012/jun/07/ray-bradbury-influence-barack-obama