Why did Latin disappear?

After the Roman empire fell, Latin disappear as the common language (correct me if I'm wrong that it was after the Roman empire). Anyway, I wonder why did it disappear? I know that it wasn't spoken like English is today but a lot of high educated people did know it. Also, could this ever happen to... show more After the Roman empire fell, Latin disappear as the common language (correct me if I'm wrong that it was after the Roman empire). Anyway, I wonder why did it disappear? I know that it wasn't spoken like English is today but a lot of high educated people did know it.

Also, could this ever happen to English or is it too well trenched?
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