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The epub3 is a minority of real ebooks and multimedia is better served by iOS & Android apps.
IMO they added the wrong things to epub3, they concentrated too much on interactive, video, animation and audio instead of simply having a better ebook experience. The only HTML "interactive" thing I'd have added was the ancient Client side pure HTML image map so tap/select/click on a different region of one image jumps to a link (page).
The existence of the non-DRM features in KFX and kepub rendering shows too what epub2 source can provide.
EReaders have a very long life. Epub 4 as a format for actual ereaders rather than iOS & Android apps with epub4 is doomed. Actual ereader support for complete epub3 in any fashion compared to Apps with epub3 is poor. Many apps support little of epub3.
Seems to me that after epub2 they lost sight of ebooks and were seduced by HTML5 and trying to be an alternative to multimedia app frameworks for iOS and Android.
I know the epub3 Evangelists have a completely different view, but I purely considering people wanting to read a novel on eink. Most screens are hardly big enough for science textbooks. Video, colour and audio needs an OLED or LCD iOS or Android tablet anyway.
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