Nor did the program meet its goal of increasing its standardized test scores. English immersion programs can not teach academics as well as bilingual education. It is as simple as that. To teach academics, the teacher needs to use comprehensible input. Bilingual education is the only program that can do this.
Bilingual educators have to explain a myriad of complex issues.
Unfortunately, bilingual educators have a difficult time answering simple questions with complex answers. The questioners' eyes glaze over and their focus wanes. Here is one observation. I once saw a job announcement regarding openings for biliteracy teachers. I think this term provides a better description of what bilingual educators do.