What you're saying essentially means that we can no longer use cheap and/or uneducated people for things from kindergarten, even creches to high school. PLUS of course, all sorts of supporting services, from sport clubs to child protection. Anyone who doesn't have the qualification that matters (ie. a university diploma in a STEM field, in this case, NOT pedagogy or ...) should be removed and kept out of those professions. We have to use qualified people, who have the qualification we target for the kids, and have to kick most of the current ones out, maybe even make it illegal for them to continue to their chosen profession anywhere.

Additionally, we would need to provide various ways for kids to spend more of their time at school (how else are you going to lessen parents' influence)?

And then, after holding on to such an investment for 18 years (a bit more), we will begin to see results?

Aside from the cost, because this would mean 300% raises, minimum, for teaching staff, this would be a social bloodbath, and the education sector will fight anything that goes 1% in that direction to the death.