I second this. Better having a 2nd language that is common for everybody than have just one language and only one way to express thoughts. I speak Italian (my mother tongue), English, Romanian and a bit of German, and I really enjoy when I discover subtle connections between words/sayings and the culture of the people using that language.

(As an analogy, what if the world decides that only C++ should be used to write programs and libraries?!? Boooring!)