Re: BOOM! A shot into the iPad's heart.
Seriously, I don't think that the Kindle(s) are going to become roadkill instantly, but it's hard to fathom why somebody would choose a Kindle over the iPad, a one-trick-pony over a multi-talent?
The big difference is e-paper versus LCD. I haven't seen e-paper up close yet, but conceptually there's a big benefit to a device which can be read easily in bright sunlight and which has battery life measured in weeks rather than hours.
The lack of color is a problem, though.
The first time I saw e-paper I didn't realize I was looking at a live display. I was duly impressed.
That being said, I would miss color...not that most of my books have color beyond the cover.
It was the best of Trek, it was the worst of Trek...
"If I lean over, I leave myself open to wedgies, wet willies, or even the dreaded Rear Admiral!"