I think it's important for humans to understand the importance of culture. To understand that everyone has one, and that we all share one. The idea that an individual has one culture and only one that never changes is dangerous to the progress of our species. People need to understand that culture is alive and ever-changing. Language comes down to necessity. The need to communicate with people in that language. If you are a first generation here in the US, it is assumed that you probably still have relatives in your homeland who you speak only the language of that location; therefore it is still necessary for you to use it. Most grandchildren or second generations, don't speak the native language of their grandparents because it's not necessary or useful for them to burden themselves with the hassle of having to learn it. They're already coming here and having to burden themselves, with trying to find their place in our society, and learn the language of the people that surround them, along with the everyday tasks they have at hand. Most people to have time to learn a language that: A. They have no use for (they don't communicate with people who speak it, and B. Most people don't have the time or opportunity to learn another language. Especially one they won't necessarily use. I believe that they will lose their ability to speak the language of their grandparents, when it is no longer useful for them to do so, or when their main culture takes another shape; thus they speak the language of the culture of their social location and not one of their ancestors.