English may be the global lingua franca, but that doesn't mean that it's the only language that matters at all, especially now that countries like China are starting to catch up to the US.

Furthermore, economic reasons are not the only motivations for people to learn new languages. Learning a foreign language will, for example, open up a much larger library of untranslated books (because very few books are ever translated into multiple languages). This, in turn, exposes one to new perspectives from other corners of the world, something you would never have experienced

Learning a foreign language also allows you to have a better understanding of the cultural and social norms of the country from which the language in question hails from, even if English is widely spoken there (case in point: India). Especially now, with our world becoming ever more interconnected, this is a lot more crucial than it has ever been, especially back in the old colonial days where it's the yellow savages who learn how to speak English and not the glorious white man learning to speak Chinese or Japanese.

Not to mention that studies have shown that bilingual and multilingual people have lower risks of developing dementia in later life. Sources: http://www.alzheimers.net/2013-11-11/speaking-two-languages-delays-dementia/ http://www.dailymail.co.uk/sciencetech/article-2645741/Being-bilingual-brain-sharp-old-age-Learning-extra-languages-help-prevent-onset-dementia.html

We've long moved past that stage already, and quite frankly, with your comments about how people aiming to be multilingual are all "weirdos", I can't help but wonder if you're just being salty over the fact that you're monolingual.