I believe that a language is a pathway to a new culture. If you want to understand why some people are so different and even achieving greater levels of success you may have to learn their culture and history. For example China is going to be the great economic power in the near future.
How China is achieving its greatness in terms of its economy and infrastructure has a great deal with its culture and language. Majority of the Chinese people don't understand or learn English. There are corresponding Chinese words for every English word. That shows the power of its language.
While the whole world is succumbing to western culture and English, China manages to become the most successful country - is a miracle.
Therefore the future holds for China. My idea is that if you learn Chinese language you get to learn and study how they are achieving its success. You can even use that to make changes to your own country and your life.
That's the beauty of learning another language.