One publisher warns that books are “in danger of becoming roadkill” in a digital war.Illustration by Emiliano Ponzi At four o’clock in the morning on January 22, 2010, John Sargent was pedalling furiously on an exercise bicycle in the basement of his Brooklyn brownstone. Sargent, the C.E.O. of Macmillan Books, had a difficult decision to make. In five days, Steve Jobs would announce the first iPad
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