There is a rather fundamental difference between PDAs and eBook readers. PDAs are now a mature technology. A Pocket PC now does pretty much the same thing a Pocket PC did 3 or 4 years ago, although perhaps in a slightly smaller package.
eInk book readers are still in their infancy. The technology is maturing and improving month by month. There will probably be VERY exciting new devices, with, say, roll-out colour screen available in 2-3 years time. I'm certainly not going to stop myself from enjoying new devices merely through telling myself that I must use my current device for "x" years.
So to answer your question, I don't know how long I'll use my CyBook for; it depends what comes onto the market in the next few years.
I don't discard my old gadgets, BTW; I sell them on eBay; they generally fetch excellent prices there; often 75% of the new price.
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