When I was in hs, there was a suggestion that Polish be offered in our schools. Many people in the area were Polish and people wanted to get the public involved.
Unfortunately, there weren’t qualify people to teach the language. Most who spoke it did not have any degree and certainly not a teaching degree.
That has been the issue in trying to have full immersion schools in Spanish too. There just aren’t enough qualified teachers who can teach all the subjects in Spanish. Spanish in Spanish is fine, but bio and chem and math? They had too much turn over.