I'm sure you know that there is a reason your opinion is highly unpopular. Language doesn't just communicate fish and net.

Poetry, songs and literature just do not seamlessly translate between languages very well. Nor should we lose the calligraphy of Japanese/Chinese/Arabic/Persian.

Humanity would lose a lot if we all went to just one language and script.

Sure, when all the rich people flee to Elysium or Mars, they will be better off with generations growing up together with a common language and script. Because the population will be small in comparison and they will be creating their own civilization.

But until then, I'd like to keep the diversity right here on Earth.