I'm confident that we'll implement "brain uploading" in the next 200 years, and this greatly opens up the upper limits of knowledge. Humans are very I/O bound, but a few of my friends have been trying out a thing where we both talk at once, since we can talk and listen at the same time. Other interesting ideas to hacking communication: add "metadata" by using hand signals during verbal communication, combine the most efficient aspects of different languages to "compress" conversation, etc.