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As I have tried to point out previously many times, epub2 is on its way out and rightly so given its limitations for many languages. Just because epub2 is good enough for english basic fiction does not make it a good choice. Furthermore an e-reader need not support all of epub3 to be useful (javascript support is not mandatory for example). Many epub3 e-readers are using webkit derived browser engines that support just about everything.
That said making an epub3 backwards compatible with epub2 only e-readers (for basic fiction) does not in any way prevent or preclude meeting Accessibility standards. You can easily do both with epub3.
IMHO, we should not be promoting the continued use of epub2 when more accessible epub3s can be made that can be made to be backwards compatible (for basic fiction) with ancient epub2 only e-readers, Amazon conversion, and etc.
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