Amazon to remove download/transfer via USB option for ebooks?

I'm a little skeptical as this seems like the kind of thing that would
require an announcement, and I haven't gotten one, but this UK pundit

https://www.youtube.com/watch?v=KMoCzeGnIss

says that the ability to download a Kindle ebook to your hard drive
is going away in a week or so.

Very worrying if true (possibly a UK only thing?)

Since I routinely put everything I buy into Calibre, this would be
an unwelcome development, though I think I could get around it (so far)
with an extra step of uploading the file from the Kindle in mass storage
mode.

Does anyone have more details?
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