My bookshelf is a testament to my agreement with you.
I also don't want to screw around with the idea that the batteries for these bloody things may not be available in future, forcing me to bin the device (and, conveniently, all the media I have purchased for it). Or the screen may get cracked and a replacement part may be unavailable in a decade. Et cetera.
If you find that hard to believe, try finding, say, a replacement screen display for a monitor you bought ten years ago. Can't find a CRT tube?! My goodness, what's the world come to? Maybe you would like to try and find a replacement VCR? They were popular up until about 2000, but you're unlikely to find spares for them now. It's not implausible to predict that components for these devices will simply not be available in a couple of decades - and why should they be? It's entirely in the manufacturer's and copyright owners' interests to make you buy everything again!
Nobody - not Apple, Barnes & Noble nor Amazon, have mentioned what the long-term support policy is for these readers. I'm fairly willing to bet that once your two-year warranty has expired, so do your books - if your device goes kaput. I would very much like to wager that any books you purchase will not be readable in 20 years, for one reason or another, and that is why I will continue to steer clear of these e-readers.
At least if I manage to accidentally tear a page out of one of my books, I can repair it with fairly low-cost tools - and, more importantly, only two sides of paper are affected: I can read the rest without difficulty. If I accidentally dunk a book in water, I can dry it out (and only one book is affected.) I would not like to place bets on the success rate of fixing an e-reader with any of the household tools I have at my disposal.
All this has nothing to do with the fact that I simply don't trust the likes of Amazon etc. to respect the contract of sale. When Amazon pulled 1984 (how ironic was that?) - it sent a very clear message: You do not buy content, ever. You rent it, until we tell you we're pulling the content from your device. Sorry, Amazon, B&N, Apple, etc: I'm simply not that stupid.