With current tech we are close to having a babel fish to put in our ear as a near universal translator. I have a dream that this will enable huge linguistic diversity, even down to one language per person, as translation costs approach nil. I could privately alias "blue" as "orange" and cause no confusion ... except for the increasingly niche application of meat speaking directly to meat.
How fast might a specialty language evolve if changes are no longer a barrier to understanding and propagate to the whole network in real time? Changes that used to take generations could happen in days or hours, meme by meme.