The advocates have a definite ax to grind in pushing epub3. Even if dedicated readers sales are declining, largely because anyone that wanted one has one, they are nearly all epub2 readers. The existing readers are all epub2 readers. So if you want to sell something, it better be useable on these existing readers.
If you are into formatting, the reflowable nature of epubs are going to drive you to distraction. This will not be solved by epub3 so long as it is reflowable. You can hobble it so it is no longer really an epub by keeping it from being reflowed.
In that case, why not just publish it as a pdf, which most of these readers and tablets and computers can all read and can be created on any computer with a pdf printer driver and a publishing or word processing program.
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