Given the current status quo, it is impossible. However, I can imagine the political world developing into an atmosphere where Esperanto might be made the lingua franca. Imagine that American and British power continues to decline, and Russia and China and German, and maybe India, become more influential, leading to a new status quo, a stalemate. Given sufficiently long stalemate, like decades, Esperanto might once again become a politically viable situation.
Well, anything's possible. But I'm struggling to imagine a halfway-plausible scenario in which this actually happens. In the situation you describe, what's the actual mechanism by which Esperanto becomes widely used? I mean, let's say we have a bunch of roughly equal Great Powers (perhaps they're the Trump States, the Islamic Caliphate, the United States of Europe, China and Russia, with favoured languages The Best English, Arabic, German, Mandarin and Russian). Within each power's sphere of influence its favoured language (or languages) will be dominant. ...
If it's worth saying, but not worth its own post, then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should start on Monday, and end on Sunday.
4. Unflag the two options "Notify me of new top level comments on this article" and "