Why do you think some languages become lost while other languages are preserved?
As globalization rapidly progresses, most people tend to use majority languages such as English, Chinese in the business situation.
Furthermore, in heterogeneous countries like United States, people can't help but using their common language to promote communicating with each other.
Majority language is gradually becoming the world's common language while minority languages are disregarded as things of past.
What are the bad outcomes of losing a language forever?
Losing a language leads to losing our culture.
Regional dialects have a lot of backgrounds regarding unique culture.
Our Mother language is our life and we are going to lose our origin and culture if we lose it.