A lot of people do not see the need of being multibilingual unless a need arose, for instance an opportunity to relocate to another nation, a great job offer in another country, business opportunity or even travelling for leisure. Learning another language sounds a bit hectic especially if you are not going to use it, but who knows, life is just unpredictable, its much better to have idea of differnt languages than being completly blank, one might need it in the near future.