The bipartisan Commission on Language Learning of the American Academy of Arts and Sciences is due to release its findings later this year. In the meantime, you can read the briefing paper submitted by the Joint National Committee on Languages (JNCL-NCLS) – The Contributions of Language to the Economic Interest of the United States.
Yes, “[i]ndirectly, the services provided by the language industry may leverage some $1.5 trillion in American overseas exports, while enabling social services across the nation to more efficiently serve our growing immigrant and Limited English-Proficient (LEP) population, now estimated at some 8% – more than 25 million individuals – of all residents of the United States.”