Your example is spurious. Writing had existed for 2 thousand years when it reached archaic Greece. It had existed in Mycenean Greece almost a thousand years before and been forgotten. A Greek decrying "youth these days rely too much on writing" was already an empty worry from the experience of almost 100 generations.
Touchscreens, smartphones and the Internet are a few decades old at most and no one knows the long term impact of them on civilization or the youth. Pretending it's the same is bad reasoning.
