Who cares? If I'm a teacher I don't want to have to update material extensively every semester / year because the language is changing rapidly. Three are plenty of good, stable languages to use.
So we should teach the students old stuff because it's easier on the teacher? This isn't history, the tech world is changing daily with new languages and technologies being created. Sticking to one curriculum because it's easier on the teacher is ridiculous.
Java is about as stable as it gets; that foreach syntax is ten years old. And if your teaching material stuck to the old-style syntax it wouldn't be wrong, it would still work, it's just not as readable as the new style.
