One standard will eventually overtake the other as the benefits of a common standard are great. Language will persist in its differentials for all time, however, as the benefits of differentiation overwhelm the efficiencies of commonality. English is the common language of banking everywhere in the world, because of the global dominance of the Bank of England and the pound sterling for the two centuries, 1717-1917. The bankers of Japan and China and even Italy, where banking was born, can converse in English. One cannot imagine all opera being sung in English, however.
Language is more like music, in which the more is the merrier.
Latin, now a dead language, gave birth to several different basic variations, with each of these branching into hundreds of further variations of tonality and pronunciation. On the other hand, Roman numerals remain very much alive, finding a useful niche in literary annotation and in the enumeration of Olympic Games and Super Bowls. One standard is so clearly superior to differentiation that it has survived untouched for many thousands of years and will survive to the end of time on Earth. These are the latitudes and longitudes that pinpoint place on the entire planet. In every language and in every culture, East, West, North and South are the standards of terrestrial direction.