One big roadblock for environments hoping to improve on the book with fancy interactive elements: they all require reading on a screen! And reading on a screen is almost universally terrible!
I've been getting increasingly worried about this—seems like a serious threat! (con't)
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For instance, expert readers generally read non-linearly, but object permanence issues really inhibit that on screens. (notes.andymatuschak.org/Maintaining_mu, notes.andymatuschak.org/Continuous-scr)
In many cases (eg. on e-readers) *performance* issues inhibit expert reading! Wild! (notes.andymatuschak.org/Poor_performan)
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Yes, I think it's one of the only interesting projects in this space.