To answer the question in the thread topic: In the vast majority of cases, no. Of the millions of texts produced each year, only a small number would benefit from being enhanced and an even smaller number of those will be enhanced due to the costs involved and the limited market.
All this is is a new product offering to expand the market, not a replacement of current product offering. That said, I can completely see publishers dumping a bunch of money into producing more books as apps while declaring it to be the future, and then watching in mute horror as the bottom falls out of the fad.
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