Extinct cultures?

Language is the way in which we communicate. It's the way we learn about ideas, history, cultures, lifestyle, trends, and more. There are around 6,500 languages. Presently languages are dying as we speak. The English language is growing and taking over the world. This is a concern to me. I've learned four languages: Latin, French, German, and Spanish. When learning a language not only do you learn how to speak and write it, but you also learn about the locations where it is/was spoken as well as the culture that is associated with the language. If we lose a language chances are we would lose the cultures of these languages as well. For example holidays that are only celebrated in Germany or France may disappear and holidays that are celebrated world wide yet with different traditions according to country, such as Christmas, may become more Americanized since the English language is becoming more and more popular. If we lose more languages we're going to lack culture and the world will become boring and dull. We would also lose history lacking language. A good example is that unknown knowledge of how Egyptians built the Pyramids way long ago. Language is important and what makes us, us. If we lose languages, then what's next or the better question is what's left?