Has the internet made me redundant?

I’ve been listening to the BBC Channel Four's marvelous series on a 100 objects that changed the world and it has raised an existential dilemma for me. I teach World Civilizations, but I am not an expert on world history, and I don’t do as good a job as this free, easy-to-download podcast does. So why shouldn't I just play the podcast for my students and shut up? Is the new media making our jobs redundant or are there ways I can use the new media to make myself more relevant?