The same is true about the evolution of language. Parents and their own kids can always communicate just fine, but across 5, 10, 20 generations it can be completely unrecognizable (see: Middle English).
My gut feeling is that as a species we are reducing the total variability whilst accelerating the change along the increasingly standardised forms I.e. I don’t think a US-UK English split would occur today but we are adding new words faster than ever
These days I can visit Imgur and appreciate a joke that someone has made using only 4-5 memes. Also language is still evolving, and the Internet of the era forces changes, such as people becoming used to being limited to 140 letter limits etc.
But even then I'm sure change to the core language must be slower overall.