To him [Havelock] the basic shift from oral to literate culture was a slow process; for centuries, despite the existence of writing, Greece remained essentially an oral culture. This culture was one which depended heavily on the encoding of information in poetic texts, to be learned by rote and to provide a cultural encyclopedia of conduct. It was not until the age of Plato in the fourth century that the dominance of poetry in an oral culture was challenged in the final triumph of literacy.
That challenge came in the form of philosophy, among other things, and poetry has never recovered its cultural primacy. What oral poetry was for the Greeks, printed books in general are for us. But our historical moment, which we might call "proto-electronic," will not require a transition period of two centuries. The very essence of electronic transmissions is to surmount impedances and to hasten transitions. Fifty years, I'm sure, will suffice.