Amazon doesn't release that sort of information, so we only guess. Kindles are very durable, but the batteries on the K1, K2, and early K3s are getting old. I have a K3 Keyboard of the second generation, however, and it is still working as good as new. (It only gets occasional use.)
Amazon still sells the DX, and that too is Mobi 7 only.
The things I would worry about are two: if the Mobi 7 conversion makes a hash of your book, aren't you risking one-star reviews? And then too, there's a world of e-readers out side the Amazon universe. Right now, my July sales are divided 3 to 1 in favor of Amazon. Overseas, I suspect it's more like 1 to 1. I wouldn't give up those sales for anything, and fancy KF8 tricks probably won't export very well.
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