I think someone could create a game about it , a game composed of story telling which as they progress they get to know more about different angles of bitcoin world which could be useful when they grew up 
I think it'll be hard for us to teach kids and for them to understand what bitcoin is for their very young age. Even adult people who are close minded and are afraid to try something new wouldn't find it easy. Kids love to play all the time. I think there's a right time for them to learn about bitcoin. Let's just allow them to enjoy their childhood without any preassure.