"Sorry Sir, but I couldn't do my homework because I accidentally deleted my textbook."
I can see it happening
Besides, buying into a non-open, one-manufacturer solution with regard to education would not only be bad, it would be plain stupid. If you can't see why... Then I'm not even going to try and explain. (It has to do with power and influence, and the unseemly amount of it you'd be giving to said manufacturer.)
But, looking at Apple's ever rising profits since 2001, it seems many people are willing to give up openness and choices for a little more convenience. Actually... Many of the people I know that complained about Microsoft's monopolistic attitude in the 90's now buy Apple, and they *defend* those same attitudes. "But it's not the same, because Apple does not have that big of a market share." Yeah, right.
If Microsoft would try this, in whatever way, they'd be fined by more than one government. They're not even allowed to incorporate a media player in Windows in the Netherlands. (There has to be a separate Windows version without one.) Let alone they'd be allowed to try and setup a one-company solution to use educational material.