I also think that the long run future of humanity is speaking a single language. The trend has not been to fragment languages but consolidate them because of th

I also think that the long run future of humanity is speaking a single language. The trend has not been to fragment languages but consolidate them because of the metcalf law effects you pointed out. But even if that language is almost certain to be English, because english changes and has so many loan words, it would probably be unrecognizable to the english we speak today.