Anecdote on keyboards & iPads: My brother was attending a high school that was experimenting with iPads for students, and humanities classes especially felt this. I bought him a decent external keyboard case and he told me his friends all followed suit, as it was like the "missing link" to making the iPad accomplish like 90% of what he needs.

Separately, I think that the better market opportunity would be for a cheap-ass Surface model -- essentially sitting below the Surface Pro line -- that could be marketed at the education market. I know MSFT has been pushing OneNote for classrooms, agnostic to the medium for how it's accessed, but the Surface pen + keyboard + tablet combination is something I WISH i had in high school