As an experiment, and as a voluntary program, I’m for it.
Spanish teaching in public schools is usually not very effective because its studied as a subject divorced from life, and for most kids even if they get good grades it doesn’t really stick.
Using it for half the day (which is what the Lake Country program does) means the language is actually connected to life which means it makes the kinds of mental connections you need to actually begin to absorb it.
Its voluntary, and its an experiment, and the parents involved are excited about it. I’d say, let it run and see how it works out over time.
I have no problem with spanish being taught as a SECOND language. Or French, or Russian or Chinese — as long as English is our FIRST language.