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It's a given that many EPUB3 files will work ok on an EPUB2 rendering engine. The question becomes: how do you make sure?
I don't know what type of infrastructure would be needed to validate all incoming EPUB3 files against an EPUB2 renderer.
Google, as reported earlier in this thread (I have no personal experience), seems to be ok with taking the "just put it out there" approach. Perhaps they have validation capability; they are Google after all. Kobo has decided to only make such content available through the channel that they're confident will work, i.e. their own software (ACCESS or desktop.) Can't really blame them for it, although it may lose them a bit of business.
Where I hope things will go from here:
1) Kobo fixes the bugs they have surrounding EPUB3. Namely:
a) That if you put a preview of an EPUB3 book on your account, the Library page will falsely list a download option for that book.
b) Sony Reader software lists EPUB3 books for sale through the on-device store, despite the fact there is no Download option for those books (meaning they can't be sync'ed to a Sony device.
2) That when/if they make EPUB3 books available for download they continue their practice of listing the format on the book page in the Details section. (They never should have removed that in the first place; it needs to stay around as long as the company does.)
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