English, absolutely!!! ASEAN will trade not only with each other by using English but mostly with the west, USA, Australia and the whole world. Although China plays an important role in trade with ASEAN, ASEAN people should be independent from China and avoid being under the Chinese influence. And that's English, pure and simple.
BUT WE NOT SURE,NOT BELIEVE ASEAN GROUPS WANT TO MAKE NEW LANGUAGE FOR ASEAN PEOPLE, BECAUASE HARD TO DO IT
NOW LANGUAGE IN THE WORLD, ENGLISH NUMBER ONE, FRENCE NUMBER TWO, SPANISH NUMBER THREE, USED FOR EMBASSY, USED FOR POLITIC, USED FOR LAWYER, USED FOR ECONOMIC, USED FOR TOURIST,...
CHINESS LANGUAGE ONLY SO MANY MANY PEOPLE, 2000 MILLION POPULATION
LAO PEOPLE IN LAOS 6 MILLION, LAO IN THE WORLD OR NEIGHBORHOOD PEOPLE SPEAK LAO MORE THAN 80 MILLION( IN THAILAND, IN CHINA, IN MYANMAR, IN VIETNAM, IN COMBODIA, IN INDIA, LAO OVERSEA,...