Yeah, you make a good point. I thought about that a bit, actually. The problem, though, is that since you can't make a generic UI based on text, they had to make a lot of aspects of the UI specific to the target application. So it isn't
On the other hand, there is evidence that many aspects of education can
, in fact, be amortized using modern techniques. If you haven't seen it before, you should take a quick glance at the experiment called hole-in-the-wall
from 2000. It shows that kids can show an amazing amount of ingenuity in teaching themselves to use computer interfaces.
The lesson from this is that once you have the capability to mass-produce ultra-cheap computers (kinda like OLPC, although they do a lot of things wrong I don't know if they're going to succeed), kids will basically educate themselves. Cut the teachers out, essentially. This notion is of course highly upsetting to a lot of people, but I believe it is the right approach. Time will tell.