He oughta know
Even those who can't accept Dick's dystopia need to be aware of it, and to know it's potentially right around the corner. I never read the book, but the film certainly gave us an alternative view of the future, one that doesn't seem as remote and unlikely as it seemed back then.
My wife often remarks how "Blade Runnerish" modern science fiction all looks. But at least its not as unrealistic and sacharrine as the Jetsons future we inherited from the Golden Age. Forewarned is forearmed.