A question that's been asked elsewhere: will older wi-fi enabled Kindles still sync over wi-fi, and can you then import the books out of the device memory into Calibre? I don't know the answer as I don't own any Kindle device but it's a question that's been asked by someone I know with a couple of Kindle Keyboards.
I suppose at some point the ability to see the device file tree will be locked down too - probably with a firmware upgrade.
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