No one device is the future of education. In today's classroom, with the various programs the Feds have put in place (No Child left Behind, etc.) what a device like this will do is make it so very easy to define each student on how well/poorly they do in "learning" mandated curriculum by how well they do on "standardized" testing. One size does NOT fit all when it comes to being able to learn, and, as importantly, being able to apply that learned knowledge in a productive manner. Simply being able to regurgitate what you have been taught doesn't give a student the skill-set and tools needed needed to make it in the world we live in today. Take a look at the current problems with College "educated" folks who have graduated and are upset because their perfect 4.0 GPA doesn't translate to a well-paying tech job. A 4.0 GPA means you've learned how to excel in the environment known as college. That ain't what the real world is all about.
We gave you an atomic bomb, what do you want, mermaids? -- I. I. Rabi to the Atomic Energy Commission