I don't think that ebooks will go away or ebook reading devices. Maybe they will evolve into something better and well they should. But if they never change they will still be good enough
My experience with the 12 books a year or less crowd is different than most it seems. I have had a fair number of people who have told me that the used to read less than a book a month and now (with an ereader) the read several books a month. It is about convenience both in getting the books and in having them with them so they are able to read when on transit, in a waiting room, on a park bench etc. At least 3 of these people have also told me that the more they read the more they want to read and since they are mature readers I attribute that to ebooks
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Conversely the 20-100 books a year crowd often seems more resistant young or old. They have a lot more time invested in reading paper and have built strong habits perhaps. I can empathise. I bought my first ereader for $379 because I couldn't easily get paper books where I lived. I doubt I would have spent that much if I could. I would have one by now of course, but I am big into tech.
Helen