Someone already thought of this and uploaded all of the contents of the box to a website! You can find it at wikipedia.com
How to market it in developed countries is going to be a tough nut to crack though.
It's aimed at places with little to no, or unreliable, internet. So if you have normal internet speed there is nothing you can't get that's on the box. Also it seems that its not even a curated Wikipedia, it's just a full clone of it (assuming for whatever language your downloading)
My kid's school uses a software called GoGuardian, which allows individual teachers to whitelist specific websites for the students in their class during their class period.