I agree that for most pure fiction stories EPUB2 is sufficient. But there are many other scopes where full EPUB3 functionality inlcluding JS would have great benefit. For example educational books with Q&A sections, interactive storylines, escape stories, science texts, etc etc.
Also, as soon as there is a broad support I would bet that there will be a more and more amount of some interactive content, and who can say today what some intelligent people might come up with. New technology usually brings new possibilities no one thought before of. So let's embrace the future together and make sure to always have enough coffee and cookies in handy...
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