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The biggest thing that textbook publishers provide is a reliable supply of the books. The bookstore can place an order and know that 98% of the time the books will be in the store in pretty short order.
I'm not suggesting that other methods couldn't produce similar reliability, but that expectation will have to be met for another method to make headway. Beyond that, it'll have to be proven to meet it to every decision maker in the chain, and that's the big hurdle, I think.
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