Standardizing OG reading instruction for all elementary teachers.
Yes! Likewise why I used OG for spelling instruction with my children, even for ones who were early and very effective readers. The statistics on reading disabilities/dyslexia are somewhat ambiguous, due to the nebulous and varied definitions being used by researchers. 15% is also a number that floats around the literature, but tbh, that's largely because the 16th %ile is -1SD. In any case, your original point remains: we have to use some kind of reading instruction with the majority of early readers, so why not use the one that's effective with the widest range of learners (including those who might otherwise emerge with reading disabilities).
...elementary math curriculum...Ideally, math teachers would be specialists, but I think we could cover 90%+ of learners even by having teachers qualified to teach +/- 2 grades around their placed class.
I'd be pretty happy if we started with elementary math teachers who didn't fear math...but yes, get the basics of numeracy right, and the rest will follow much more easily. Thinking of the absurd number of students I see who complete single-digit addition by rote, count backward (on their fingers) to do single-digit subtraction, and skip counting/repeated addition to multiply...in high school.
And finally, yes, replacing recess, gym, art, music, and free play with more academics and test prep has already collected a body of evidence regarding its counterproductive effect on academic achievement.
