My dad recently bought a Nook (pre price drop) and one of the reasons he went for it over the Kindle was the wi-fi only version; he didn't need or want 3G. At $150, these things are going to start popping up everywhere.
he didn't need or want 3G
There are also people like me who are already carrying around the HTC Evo with a built-in wi-fi hotspot. I might grab a wi-fi only Kindle at this price.
Exactly. People are beginning to carry their wi-fi around with them, and those who don't can easily find a nearby open hotspot. At $150, my miserly instincts start breaking down in favor of the convenience of 'a book of books' (what Mom calls Dad's Nook).