Still I can say let the children have fun during free hours and focus on study during learnig hours. It is more helpful than forcing them to learn about Bitcoin. Before teaching any advance, we should build the fundamentals first. and that is by letting them focus in their school activities.
While I agree with you in part, children are a lot more smart than we give them credit for so I dont see what wrong it could do to a kid to explain to them how something like bitcoin works, if they know how to use a mobile phone and know how to send a text message then they already know enough to understand the basics of bitcoin.