The history and culture of any people forms its language. Language in turn subtly shapes our thoughts and therefore our culture.
I was told that in Turkish the word for tourist is the same as the word for a guest in your home. Certainly we were treated more as invited guests than as foreigners or potential customers. I wonder how different it would be if the synonym for tourist was invader.
If everyone spoke Earthian in addition to their own language I wonder if the other languages would be lost. Most Dine' (Navaho) I met speak English fluently but Dine' to each other, I don't know if that will continue as they disperse or not.
Not a definitive answer to your question but...