I completely agree that Pearson sells itself as innovative but it is anything but that! Their "mylab" type products aren't innovative. It is just the same old same old. I would even argue that it has been counterproductive because they're now moving to FORCE students to buy new expensive textbooks to get the homework grading code. Pearson has absolutely zero interest in disrupting anything. They only care about building their monopoly on textbooks.
However, I am an optimist and believe that even with well entrenched interest groups (big textbook publishers, school districts, unions etc.) there is still paths to disruption. At a fundamental level, education is simply teaching someone something new. That's it! If you are providing something quality then people will naturally flock to it or share it.
I think the future education startup simply needs to focus on building high quality learning materials. Then either give those products away for free or innovative monetization models (ie. watch 5 video ads to unlock the content etc.). Don't focus on trying to sell to school districts. Focus on going straight to the consumer: students or parents. Every student I know is already going online to get extra homework help, resources, youtube videos etc.