I do think the textbook industry is ready for disruption, but it won't happen by someone VC funded that essentially just wants the money going to the incumbents to themselves.

The disruption I'm expecting to happen is quality CC licensed content. Well, depending on the topic that already exists, but what needs to happen I guess is mainstream mindshare.

A lot of the $$$ in the textbook industry is just air ("Hey, basic math hasn't changed in 100 years and we haven't figured out a better way to tell the story, but anyway lets add a few fluff paragraphs and reshuffle all the exercises so students are forced to buy the new edition").

But TBH, at my university the teaching staff largely disliked the textbook racket too, and came up with their own exercises, thus allowing students to use any edition of the chosen textbook.

That being said, I'm just appalled at the poor quality of many of the textbooks from the major publishers. It's like they're selling by the pound, and thus end up with phonebook sized monsters that spend an amazing amount of pages explaining very little.