[issybird]

I think ten years is a good-enough working proxy for "the device owes you nothing". At least it's the one I used in the past year when both my Fitbit Zip and my Aerb waterproof MP3 player died. So in light of that, I don't see why Amazon shouldn't go to a KFX only model. Given history, I'd expect Amazon to add a sweetener in terms of a nice deal on current Kindles for those who own and use moribund devices. I'm no Amazon apologist (unlike most in this thread, I haven't bought a Kindle book since November, 2023), but that would seem like more than ample compensation.

ETA: I'm with @jhowell in thinking D&T will go, but that direct downloads to legacy devices won't (not yet), but I don't think there's a great injustice in either scenario.