I still think the immersion should be a PTA sponsored program. Especially in a place like Mclean where the parents can more than afford to keep it going. In my opinion, music is much more important.
I don't think the PTA can technically sponsor the immersion program. PTA funds can be used for certain things, but not for teacher salaries. Immersion requires having those specialized teachers on staff. Not to mention that if the PTA doesn't raise enough money, what happens to the immersion program halfway through the year when the PTA can no longer support it. It's a little different than a club, or the PTA planning to buy a dozen new computers for the school but then realizing they can only buy 5.
Anyway, I'm sure you realize that both music and foreign language are important and it's really a matter of personal opinion which one is more important to you. Both have tremendous benefits. I am a supporter of the band and strings program, but I also find it disgraceful that our school systems in the US don't start foreign language instruction in elementary school as part of the general curriculum. In other countries, children begin foreign language study MUCH earlier. And I think foreign language and immersion should be offered in more of our schools, not just in the afffluent schools where parents would pay to support the program.