Whereas I don't think the id should be changed. There's an argument for the existing id to be made to validate within the new format's rules, but that might not be possible given all the schemes that epub2 allows. However in my opinion, id-changing decisions should always be firmly in the content creator's camp and not an algorithm's. I certainly wouldn't recommend that an epub2 to epub3 converter automatically generate a new book id by default. Let alone attempt to alter the scheme used.
Something like this would be better in its own ID-related Edit plugin, I think.
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