If we were freezed in time right now, and woke up in the year 2090, we would be surprised and shocked to find ourselves there. If we had no way of going home, we wo uld have to stay, and adapt to the new cultures. We have not seen what has transpired before that, so we do not know what to do. But, if we had stayed in 1990 and let our evolution take place, we would have seen everything. In the future this is like learning a new culture all by itself.
Language changes with historical occurences and time.
Time changes it, the influences of people change it, history changes it. We all live it, and the change everyday is so subtle we often cannot detect it. If we were zapped into the future, we would find it foriegn, because we do not know the language and cultures. Historical influences can unite two cultures, destroy many, make new ones. We all have a different perception of what language is and how it changes, and it might change when we share that information with others, getting their ideas and using our own.