The reason I learn other languages is for the challenge, as well as the reward of being able to talk to foreigners, even better if it's without the language barrier. I love meeting new people, but only being able to communicate in a single language limits who you can meet, and what stories, cultures, lives you can hear about. I think it's quite sad that English is becoming the dominant language in most countries (or quite a few influential ones at least) and we are forgetting some of the most beautiful sounding languages that will just disappear one day.