This, via SFSignal, is a video of 9 great SF writers. It dates from the late 1960s to the late 1970s and has some of my favorite writers explaining why SF is important.
A nice quote from Asimov:
To those of us who remember the golden age, we are now living in a Sciencefictional world, and one which Campbell’s Science Fiction did significantly succeed in creating.
It is unfortunate that, even in 30 to 40 years ago, these writers are speaking as though Science Fiction has completed its function in society. They speak about fulfilling a promise, as though Spec-fic is done deal and the future is now.