When your Kindle dies in 10 years, what's the chance that you can't transfer the ebooks on the new device you bought ?

Personally, I tend to agree with Vornaskotti on this:

Of course, I don’t really control the books I buy from Amazon, who still has the power to close my account and at least in theory render all my books unreadable. In my case the same applies in here as with comics: I don’t really care. I’ve been getting rid of useless crap in our apartment in a steady pace for a couple of years, but for a long time the bookshelves stacked three novels deep have been The Great Untouchable. This year I conquered it too, and I’ve been taking my books to an antiquarian by the bagful.

It seems that I very rarely re-read books, even those I really like. If I do, it’s ten years later or so, and with that kind of frequency I can bloody well buy the book again, unless I want to borrow it from someone.