I had the same experience working as a youth counselor working with Mexican American kids in Chicago while in Grad School. English is a seductive language and I have yet to meet a second generation (or an immigrant who was brought here as a child) who has not mastered at least spoken English.
I hate to be so blunt, but all of those folks who believe that "English is dying" and "Latinos don't speak English" are a bunch of...nah shouldn't say it.
You are exactly right. English is the language of the Internet - English is used by Air Traffic Controllers all over the world. If a Danish jet lands in China - both the Danish pilot and the Chinese controller speak to each other in English. English is the preferred language for scientists. American pop culture has spread the use of English all over the world - to the point that other cultures are fearful of losing their native tongues to English. English does and will more and more dominate the cultural, scientific and most importantly - the world of the Internet.