I just read the reviews from the future and most of them only scared me. Some even say about upgrade from e-ink which is just a horrible idea. The only reason I want an ebook reader is to spare my eyes. Otherwise I can read on my laptop or phone.
That's just one of the scares

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I am wondering if it is possible to buy previous generation when the new one is launched? Like, if kindle 4 is launched , will I be able to buy kindle 3 for a little while? just in case kindle 4 will be a downgrade

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How was it before? Could you buy kindle 2 with kindle 3 already on sale?