That said, how would you teach it?
I'm no teacher and have no kids, but here's some things to thing about:
A mandatory music appreciation course at least every year. Take 'em through different styles and around the world. Maybe twice a month for grade school and one course a year for high school. This could also take form as live demonstrations once a month. Get the parents interested, invite them too.
When I was in second or third grade, very early in school, they showed us a demonstration film of all the instruments in the orchestra. And right after the film, they asked us what instruments we were interested in playing. I chose the oboe and they talked me into the clarinet. Get them while they're young!
I took lessons at school until I started private lessons on the piano, that's another story. But I'll add that when we moved back to NJ from Ohio, they had the whole class playing these horrible metal flutes. I really hated that, but it could have started some kids down a more sophisticated musical path.
I perform sometimes with a dance company. One of the dancers (English) said something about having to learn an instrument to make some kind of grade, college admision scores maybe? I'll ask her next time.
I know you can't force this down kids throats or even the parents. There's always parents and admin who are going to think music isn't that important. We always had an art class, but music was optional.