[johnloeber]

I also doubt that online education at that level will have a big impact, but that's because of the properties of that age-group.

Online education usually already requires some educational foundations -- an app to help you learn trigonometry might be effective, but I doubt that an app to help you learn to read would be very effective. I also think that young children in this age-group tend to learn more by watching, interacting with, and mimicking adults than from objects. The educational foundations of the primary school level will likely have to be supplied by adults.