i expect old style indexes to become redundant, as readers learn how to use their device search facilities.
why bother to go to index pages to then scroll in order to look for a word when you can look for any word, any time by bringing up the search menu.
If I set out to read a non fiction book with index, I usually delete all of the index xhtml pagesbefore starting, as it's a waste of space & gives a false sense of how long the actual book is.
Also, new features like Kindle's x-ray will hasten the obsolescence.
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