It’s sobering to imagine modern English as an archaic dialect – how the language might evolve and how our version(s) of it might appear from a position many generations into the future. That English will change radically in a few centuries or a thousand years is beyond doubt: read a few lines of Old or Middle English and you’ll get an idea of how much.
This presents a problem when communication with people in the far future is an absolute must. Whatever about literature becoming ever more impenetrable, how do we warn future humans about dangerous contaminants that we’ve buried for safekeeping? It’s not enough to isolate these materials now; they may need to be kept isolated for a very long time.