... can actually be very useful. In a world sadly driven by pragmatism, you do NOT have to have a "practical" reason for learning a foreign language. A foreign language will enrich your life and sharpen your mind. These two benefits alone make language learning an amazing process. I will never see the world again as I did when I was a monolingual American.
Learning a "useless" language can be very useful indeed. It is a priceless experience.