And, rightly or wrongly, that shared language will likely be English. It is already the language of commercial aviation, and it is the language that people in Europe (any other places presumably) use to talk to each other when they don't share a native language. And sometimes even when they do.
It is in some ways a bit peculiar, with a simple grammar but extensive vocabulary (much of which thieved from other languages). It is on the face of it quite ugly, however great poetry and works of literature have been created using it. Some non-native speakers say they feel freer using English instead of their native tongue, but of course that is a somewhat nebulous proposition hard to substantiate, even if there is a little truth to it.
The term thieved is too strong here. Languages borrow words all the time, like how various English words have made it into other languages.
Many of the French words came about due to England being invaded by he Norman French. A lot of food words come about due to using the native terms for those -- this is why the meat words are French based and the animal words are Norse/Germanic.
In Florida, you see a lot of Spanish words entering English due to the cultures co-existing and mixing. This happends a lot near country borders where you see languages blend together as the different speakers mix.
Do creole languages (of which there are many) steal the words from their parent languages?
The relatively simple grammar is a huge advantage. The major complaint I’ve heard from learners is about the spelling. It would be nice to reform the orthography, like the Academia Real in Spain did
It is in some ways a bit peculiar, with a simple grammar but extensive vocabulary (much of which thieved from other languages). It is on the face of it quite ugly, however great poetry and works of literature have been created using it. Some non-native speakers say they feel freer using English instead of their native tongue, but of course that is a somewhat nebulous proposition hard to substantiate, even if there is a little truth to it.