A language is more than only a way to communicate two persons. A language it’s a mirror of one culture, a way to understand the life, often it reflects their landscape, their spirit and the way how their ancestres gain their life.
Our occidental culture trends to have the same cittys, same tv programs, same hobbys. At the end you can stay in Portugal or in Holland and will be impossible note some difference. The only trait wich made us different is our language, we don’t can lose our main identity.