Langauge is the key to the soul.

Languages come and go as do parts of the human anatomy. A language that may have once been useful, and universally used, will fall to the wayside when I more concentrated, or easier language comes to take its place, making the use not only easier, but negating the need for the older one.

While a language is part of the core of a cultural identity, as cultures change, so does the identity itself. If a language is in a transitional phase, it could be swept up and replaced by a new one.

Whenever a language dies, or is pushed to the wayside (not commonly used) part of history is changed. As people forget, things like documents, carvings, anything used in that dead language begin to fade from human knowledge.