Is this comment still taking into account all the ~8 yr old common core changes to math curricula around the country? Even that's 200 years out of date? What're we supposed to be doing with five year olds that's so much better?
We could be teaching 8 year olds how to use crayon drawings to solve differential equations, graphically analyze back propagation, analyze electronic circuits, and validate quantum teleportation protocols. This stuff is fun and relevant to understanding the technological world all around us.
It would be about as easy and fun as common core. We have a lot of new math from just the last 15 years that shows us how to present these really complicated subjects in a simple way by doodling diagrams that are so simple that even a kid could learn it.
For an example, look up "Kindergarten Quantum Mechanics" by Abramsky and Coecke. They only joke about teaching it to kids. But I think that kind of stuff is definitely how we'll teach our kids 100 years from now, when quantum computers might be important for even kids to understand.