I do not believe that any government should ban people from speaking any language they wish to speak, or that there is nothing valuable in languages other than English, or even that English is a better language than any other. However Given that English is a language used throughout the world, and especially in the most important country in the world, the US, it makes sense for parents to prefer their children grow up speaking it.
The universal use of English has precedent historically. Various other languages have been nearly universal at different times in history, particularly amongst the intelligentsia. (Latin, Greek, German even to some extent Arabic and Chinese). The plain fact is that most scientific inquiry currently is conducted through the use of English, and not to know it is a huge disadvantage.
Furthermore, with the internet and other modern digital technology, it is more likely than at any time in history that we will be able to preserve other languages for posterity. The preservation of a language is no longer dependent on it having active speakers, so this alone cannot be a reason for forcing children to learn it in public schools.
I admit there will be, and even I feel, a certain loss at the fact that many languages are (and will) vanish across the world in the homogenization of culture that is part of globalization. However, nostalgia is not a valid reason to hold the people of the world back from embracing a scientifically advanced future.
