I know this has been requested before, and may be targeting a small audience to satisfy, but I would love to have the option to pull up Khan Academy on my Amazon Firestick. I could see the app replacing the countless hours I would otherwise devote to senseless TV shows and movies on Netflix.
If you can make learning available on devices that are commonly used for leisure, I believe more people would be more apt to utilize and explore what they don't know. (It's already on the App Store, why stop there? Maybe go so far as to create an app for smart TVs as well if not already available).