People forget that digital music and mp3 players were around for a long time prior to the iTunes store opening in 2003 and that while the big local cd stores pretty much collapsed by 2006, people still buy a lot of cd's. Shifts tend to be more generational than instantaneous.
From my standpoint, the fact that younger kids tend to prefer physical books to ebooks is the more interesting thing. Some of that may simply be that most kids don't have their own money, and thus use libraries or trade books rather than buy ebooks.
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