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I think it might be good to have a universal language, but I think it's vanishingly unlikely that Esperanto or any other deliberately manufactured language will become one. The way languages get (anything like) universal is by being widely used, and the way languages get widely used is by being widely useful. I don't see any plausible way for something like Esperanto to achieve that. English might become a universal language. Maybe, depending on how the world goes over the next few decades, Chinese or Russian or something. But it won't be Esperanto. Pretty much everyone whose knowledge of Esperanto would make learning Esperanto valuable already speaks English.
I think you're being too pessimistic about Esperanto: