Only 8 percent of the people Google interviewed for this video (I'm guessing this was December 2008) knew what a web browser was. Does this mean all these people are stupid? Not really. Most effective speakers cannot diagram their sentences. But it indicates how long it can take for a basic concepts like a "Web browser" (I think Mosaic dated to like 1992) to filter into the mainstream.
We tend to see change as occurring rapidly and anticipate that it will always accelerate. But I keep seeing little signs that suggest (to me) that modern society is pushing back against The Law of Accelerating Returns, either consciously or subconsciously. This doesn't invalidate the principle, but it ought to temper some of our predictions.