Thing is, over here there's not much reason TO learn more than 1 language... Over in the EU it's basically like every country there is how a state is here... You're in very close proximity to places which primarily speak other languages, so there's use in it... I have to travel nearly 2,000 miles (3218km) to get to Mexico, and the chances of me running into someone who isn't fluent in English in any state anywhere near me is almost 0.
That being said, I think being monolingual is a good thing, and our species as a whole would be better off if everyone spoke the same language (not saying that one language should be English, for the record).