Your post reminds me of a photo shoot I did a few years ago. It was for a teacher of the year recipient nearby. She taught a primary grade and in her class, the children collectively spoke six languages! She refused to teach them bilingually, tho, speaking to them in English only. She told me that the children were picking up English rapidly and were doing well in their studies--even the Russian children. It was amazing to see--the children beaming as they read aloud in English.
That day forever cemented my belief that bilingual education is a tragedy and should be struck down immediately.
I agree with you.