As human populations grow, languages tend to simplify over time. This is because larger populations require more efficient and streamlined communication, which can lead to the loss of complex grammatical structures and the simplification of vocabulary. For example, in the English language, the use of the subjunctive mood has declined significantly over time, and many words have become shorter and easier to pronounce. This trend towards simplification is likely to continue as populations continue to grow and the need for efficient communication increases.