[mjbeswick]

Language naturally evolve over time in a way which allows efficient communication, so it's not something which should be controlled. The simpler a language is the greater number of people it will be able to be understood by.

The whole purpose of any language is facilitate communication between people. I would argue that the quality and usefulness of English has increased over time, as it would be very difficult to use English from even 100 years ago in conversation today, as it would lack the words to express every day topics.