It's not just the US, languages are changing all over the world (whether the French Academy likes it our not). There are a lot of Spanish-speaking folks in the US, yes, but the second generation (and many of the first) are learning US English. It's a two-way street though, as many Spanish-based words are in US English (lasso, riata, dally, taco, and many others). All living languages change and evolve to meet new conditions.

The language of the airlines and the computer is basically English.

Me, I'd study Chinese if I wanted to speak the language spoken by the greatest number of people....