Lovely collection of quotations from the early days of radio, film and television in the New York Times helps contextualise today's hubris. Couple of examples:
Radio 1922: Bruce Bliven, in The New Republic:
"There will be only one orchestra left on earth, giving nightly worldwide concerts; when all universities will be combined into one super-institution, conducting courses by radio for students in Zanzibar, Kamchatka and Oskaloose; when, instead of newspapers, trained orators will dictate the news of the world day and night, and the bedtime story will be told every evening from Paris to the sleepy children of a weary world; when every person will be instantly accessible day or night to all the bores he knows, and will know them all: when the last vestiges of privacy, solitude and contemplation will have vanished into limbo."
Television 1939: New York Times editorial:
"The problem with television is that people must sit and keep their eyes glued to the screen; the average American family hasn't time for it. Therefore the showmen are convinced that for this reason, if no other, television will never be a serious competitor of broadcasting."