I am late, but I find your post interesting, so I give a comment. What I understand is that the world needs a unifying language apart from everyones mother tongue. Abaut 100 years ago it was already a important topic and at one point Esperanto was nearly chosen. There needs to be a political agreement on that issue first. As long as all nations do their own thing nothing will change and we have to translate in the UN everything in 5 officially recognised languages.
As you are talking about English, which one you mean? That from the airports and bars around the world or old English or American English or even pidgen English? English is changing so fast. Maybe one day(after the big collapse) a simplified standard English will be used as auxiliary language or even a kind of Esperanto.