Brighton et al. encourage others to investigate how factors other than innate individual psychological biases could influence the shape of languages.
Brighton, H., Kirby, S., Smith, K., & Building, A. F. (2005). Cultural selection for learnability: Three principles underlying the view that language adapts to be learnable. Language Origins Perspectives on Evolution, 1–16. Retrieved from http://www.isrl.uiuc.edu/~amag/langev/paper/brighton_threehypotheses.html