Not "for knowledge" but "FOR OWN", We Will Have to Learn English.
I said, that I prayed with English in my church. I was happy because my English made foreigners understood. I want to learn English more because I want to watch various things of Japan and the world. By the way, Mr. Narita Yusuke, the vice professor of Yale University, said, "In Japan, the English's needs will polarize. Ones will need English deeply to communicate foreigners deeply, but the others will need minimum English knowledge by using translation app and so on." But I think that inbounds and foreign labors will increase in Japan for future. To incorporate their needs, we need English to communicate. (There is also "plain Japanese"). Therefore, not "for knowledge" but "FOR OWN", we will have to learn English, I think. English will become important equal to Japanese. According to BBC, the brain of bilingual is activating more vigorously than monolingual. Anyway, by using English more, we have to learn English.