Never buy another ebook from Amazon, sure.

Never buy another Kindle? I keep mine in airplane mode all the time and sideload all the books/papers I want to read. It works practically just as well as when I bought it. Why wouldn't I buy another? If Amazon makes a Kindle with color at 300 PPI, I will.

Sure, proper EPUB support would be nice, but if I need that I can jailbreak and install Koreader.

If there's another device with comparable hardware/software/battery, I'd consider it. AFAIK, Kindle still has the best standby battery life.