Most of the people all over the world know English and a good part of them is able to communicate freely in English even if it’s not their native language. Of course English is the most popular language on the planet and one of the reasons for this is because the Internet and the media are filled with English. So why learn other languages if English is so overwhelming?
But to my point of view it’s important not to be ignorant towards other cultures and especially other languages. Also there are a lot of other popular languages (like Spanish or Chinese) that are becoming more and more popular. You never know what country will be dominant in the future and what culture will be popular. To my point of view it’s important to study Chinese language as one of the most popular in the Asian region.
And of course there are also people who like different tongues just because they like them and they like to communicate with different people. And I personally think that this is the best motive to study languages because this way you’ll be able to enjoy the process and be able to involve with all of your personality in the simple process of speaking. The diversity makes our life interesting and beautiful and thus any additional language is a key to a whole new world of thinking and feeling.