Actually the moment we will finally stop treating computers as glorified typewriters and use paper and desktop metaphors, content will indeed be code. Good web content in the future, I believe, should have interactive visualisations/simulations and a multitude of possible user interactions (see for example http://worrydream.com/Tangle/). Publications like the New York Times are already implementing this, I also expect it to happen for educational content (see Khan Academy for some examples).