Without him, we wouldn’t understand the Butterfly Effect. In a timeline not far from this one, where Bradbury’s works went unappreciated, time travel will never be possible. It wasn’t a squashed butterfly which caused it. It was carelessly trampled dreams.
Over in that timeline they have few satellites, more books are burned, and there are no cell phones due to scarce imagination and, perhaps, for want of Ray Bradbury’s descriptions of “seashells” and “thimble radios.” They also have no internet, and so can not read this post. It’s a pity. They don’t know what we they are missing, or who we are missing.