My off-the-cuff calculation of the impact of digital technologies on cost has always been a two-times-order of magnitude reduction. In other words, something that used to cost $20 - like a CD, maybe - should be 20 cents post-digital. A lot of content has reached this valuation, but a lot - including advanced education - still has a way to go. The lectures described here (surprisingly) still have a way to go - Audible is expensive compared to other audio-only services. But we're getting there. Which is why universities have to focus on something other than content.
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