This is a great idea whose time has surely come. I wish American schools would emulate this practice! For one thing, by making coding mandatory you'd eliminate the 'geek' factor; all students would have to study it, so there'd be no social stigma attached to anyone who chose to learn coding. For another, youngsters typically have no idea what they like or are good at, so early learning could open doors that otherwise wouldn't be discovered.
Granted, it's difficult to squeeze in another item into kindergarten or elementary students' already busy agenda. An advocate of the arts, music, and sports, I certainly don't think any of those important subjects should be cut (although too many districts are placing them on the chopping block). That said, surely there's a way to incorporate coding into math or science if schools can't create entirely new classes?