[scrozier]

As an experienced (semi-professional) musician, I think this is probably a false dichotomy. For one thing, "users of music notation" implies that these users know how to use it. Very many "amateur" musicians read traditional notation just fine. It's not that hard.

There is really no such thing as a "decision-maker" for music notation systems. That ship sailed a long time ago. There is no orchestra conductor anywhere pondering whether or not they should abandon a millennium or two of traditional notation for something "better."

You would be doing your elementary music students an enormous disservice by teaching them some "alternative" music notation system. And for what reason? As I've said elsewhere, learning to "read music" is far easier than many things we ask elementary students to learn.

Apologies for excessive "quotation marks."