mankind will largely speak a single language in 100-200 years or so from now
I don't think, but still, it's really useful to learn English, not only to participate in free software projects, but it's quite good if one travels to foreign countries (people living from tourism tend to speak English even in Japan or France) or to read the newest Harry Potter book when it's published, not when it's translated. There's a Hungarian proverb: "you're as many people as many language you speak", which is very true.
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