Of course, Stephenson also slyly suggested that the ideal remote-teacher-to-remote-student ratio remains one to one: Miranda sacrificed her career to raise Nell, remotely.
If you still need a human teacher, and that teacher has to be paid, what exactly have you gained by interposing the Kindle between the teacher and the student?
Greenspun once theorized that you could pay teachers in low-wage countries to do the tutoring, but I have trouble believing this will work. Communicating over a teleconference link is hard to do, even when there are adult-aged engineering graduates on both ends of the link. Show me the person from a low-wage country whose flawless command of English and uncanny ability to communicate over the phone allows them to effectively teach eight-year-olds from half a world away... and I'll show you someone who won't keep a low-wage job for long, because someone is going to offer them a high-wage job.