Gibson himself is well aware of how science fiction becomes dated. He even wrote a short story partly based on that concept ("The Gernsback Continuum") in which the main character suffers from visions of the 1950s "future that never was." Personally, I don't see it as a problem. As long as the world of the story is logical and self-consistent, does it matter whether it matches up exactly with reality? And as other posters have noted, Gibson's work is less about the technology itself than the technology's effect on society. And his views on that, I think, are still quite relevant.