There were many lingua francas of which French was supposedly the first global lingua franca. That changed and it became English (from what I understand). We will probably see another language become the lingua franca, so my question is: should it be English? Are there better candidates out there? Why / why not?
Now try to learn Portuguese, or German, or Russian. English has wonky phonetics, but has a relatively simple grammar. As a bonus it’s not properly standardized, so whatever you come up with is going to be correct in at least one of the existing dialects.
Plus English has influences from everywhere. In my oral abitur exam, I got stuck once or twice and made up words by anglicizing the pronounciantion of french words gaining extra points and impressed faces.
That works for almost all European languages. In one of his books Richard Feynman tells a story about when he went to Brazil and didn’t how to say “so” in Portuguese so he used “Consequentemente” by adapting Consequently and everyone was impressed with his fluency.