"But the device is not the key limiting factor at this point, at least in most countries. If we ever get the curriculum to be super, super good, then the access piece, which is the most expensive part, will be challenging, requiring special policies to let people get access. The device, you'll be able to check out of the library a portable PC, so I don't see that as the key thing right now."

Via http://news.ycombinator.com/item?id=4161666