I believe it's more an additive thing than a hockey stick. It's credible to believe 50% of Amazon book sales will be ebooks can be reached in 2012 ... elsewhere, not yet ... but that's on track too. And there will also be fewer dedicated places to buy books in 2012 and 2015 ... but the fall off to 0% of physical books in the next 10 years ... doesn't sound likely.
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