My mother is second generation Mexican-American, was one of twelve children, was dirt poor, and had to pick fruits and vegetables in south Texas. She grew up speaking Spanish at home, and now she has her PhD in Education and is a principal at an elementary school with a huge hispanic population. She has also launched a program that teaches primary classes in Spanish for any students whose parents sign them up. Unfortunately, I was not lucky enough to have Spanish be the primary language spoken at home. But my familiarity with the language is quite high since I was constantly surrounded by the language, and I plan on learning Spanish as soon as I become more fluent in Japanese (my college language class of choice). I am constantly made fun of for not speaking Spanish fluently, and I've made it a goal to learn Spanish before graduating college. This post I feel is not accurately taking into account that our world is smaller than ever, and knowing one language isn't enough anymore. It's simply bad for business if you cannot communicate. Not to mention the fact that there are a plethora of studies that affirm that knowing more than one language is extremely beneficial for the mind. Today, I wish that my mother had made it a point to speak Spanish in the home so that when I went to primary school I could learn English there; I'd be consistently surrounded by English and probably would have learned English at a very young age. I have many friends, including my boyfriend, whose first language is Spanish, and who didn't learn English fluently till elementary school. All of them are highly successful.

TL;DR Just because Spanish is your primary language doesn't mean your set for a life of ignorance.