In my own personal business, I estimate without native English proficiency my employees would be worth 1/5th or less of what they are to me now. I would have to hire an bilingual manager to run projects, and that person would have to be paid a lot. My turnover would be higher and the accuracy of instructions would be diminished, thus resulting in slower project execution times.

Irregardless of the non-ideal situations of the past, current citizens with English proficiency benefit enormously -- in the form of money.

Being proficient in English is a really big deal. As an American child I was told over and over again that it was important to learn a foreign language to increase my ability to get a job. As an adult, I found the opposite, that English above all other languages was critical in running a successful international business.