...you need to know how to communicate with everyone else. To do otherwise will limit your abilities, and make you easy to come under the sway of unscrupulous people.

This is also why you should learn Spanish.

I don't see a problem with English as the national language.

I think it's pretty pointless. English is what works now but in 100 years it may be French. Who knows? Who cares? Why make a law to enforce it? The people will decide with their tongue.