What's ideal Khan?
We hear Sal and team say this all the time: "The time in class needs is freed up to do project based learning." The higher-on-blooms type level of learning -- creating. Many educators would be thrilled to be able to do this in their classroom. Projects all day every day? Sign me up! Here's what it would, and should look like in order to achieve that goal.
At school: Students working on projects, keeping an online portfolio of projects, like adults do by blogging. Ex. Sahil, Adi, Jesse, Marc, and many others. Edit: Just found this: Make HTML5 websites with wix!
At home: Students working through Khan exercises.
So, what's the problem Harsh?
When using Khan Academy, students first prefer to learn from each other, then the hints, and lastly, Sal through his videos. However, if students are to work on KA at home, they don't have the number one resource they use to learn at their disposal--each other. Khan Academy isn't social or multiplayer. There's no way for KA students to connect to their real-life classmates, or even other students on KA. (Besides the Q&A below videos, which is a small step towards social).
Make KA social, or multiplayer. Or create a webapp that allows students in the same class/school/region/country/world the ability to interact live with each other after-school, when they're struggling with school-work independently.