Thai students decreed to speak English - Channel NewsAsia
If they achieve widespread English proficiency in Thailand, they will be great competitors to us.
China's population is also keen to learn English. They will catch up fast in 1 generation.
The country that did not encourage widespread learning of English is - Japan.
Japan was very rich, powerful and successful in the 1980s. The hubris got to their heads.
A Japanese Minister even wrote a book named "The Japan That Can Say No".
The attitude was that you must learn Japanese to communicate with them.
They don't learn your language or a common language like English to communicate with you.
So China and South Korea will surpass Japan by as time goes by. You can see it economically already.
Japan's leadership is sometimes behaving like the ancient Chinese Ching Dynasty that led inward-looking China to ruin.