It would make sense that a thousand years in the future, with the mixing of cultures and languages, English doesn't sound like English at all. In French a few arabs words have made their way in (mostly for slang) thanks to the big north African community we have and also many english words due to how shorter they are (like email vs "courrier electronique"). To the great sadness of the far right and/or academician^^
English itself is an abomination. It's Saxon peasants trying to speak French spoken by Norse. With some germanic words sprinkled in for good measure.
Just have a look at "old" English, and imagine trying to speak and understand that ! "Do thou hast a laser for thee ships ? No ? God be with ye then !".
I understand some multilingual gibberish would make the game unplayable, but I don't mind the strong accents from all over the world and the casual grammatical errors and the like. I wouldn't mind either if those strong accents had some unique word (like the Russian one with a Russian word or 2). If the ATC said "Welcome Komandir" I still would understand it^^ It's better than "British in space" IMO.
I personally quite liked the Belter dialect in The Expanse, taking words from all over the place and mixing it. It was still understandable IMO, even if it would be far fetched for ED (it still need to be more easily understood).