if you want to have an international career and lifestyle… Yes . If you are content living in your own little world where everyone speaks the same language. No.
IT all depends what kind of life you want.
It also depends though on what is your main language. I think as English speakers we are lucky our language is the dominant language , so we can almost go anywhere in the world and get along.
However by learning another language, you do open yourself up to a world of possibilities, all kinds of friends etc. It can make your life exciting. Especially if you want to go live in that language. e.g Just think of all the non-native English speakers that have English speaking spouses. They would probably never have met their spouse if they hadn’t learned English growing up.
IT all depends what you want out of life.
Not everyone is adventurous. Some people are comfortable in the surroundings they grew up in and some more adventurous.