But if Britain leaves the EU, there will be a dramatically reduced pool of native English speakers to recruit from, because you need to have an EU passport to work in the institutions. As people retire, fewer native speakers will work in the EU, meaning they will have less and less influence on and authority over the use of English in these contexts. This means “EU English” will likely move away from British English at a faster pace.
Seriously, who cares how foreigners jabber to each other? As we all know all we’ve got to do is speak louder and they’ll understand perfectly well.