Fewer Languages

From now until the year 3000, the several thousand languages that are currently spoken will be reduced down to less than a hundred, as ethnicities are drastically diminished around the world. As such, English, Mandarin, Spanish, and a few other languages will be vying for the top spot as the universal language of our species. In the end, cultural memes will all eventually just blend together in the great melting pot that is the world of consolidated cosmopolitan megacities.