I don't think one should be FORCED to learn a language. A choice is cool, but that's all it should be. There are MANY people who will, in their life, have absolutely NO need for a second language, and if that happens, then schooling was just wasted when it could be teaching students something that would be relevant later in life. That said, there are careers that do need it, but those that embark on said careers are the ones that are ever dedicated, and DID take the classes when given the option.
But that's the thing, school rarely teaches you anything that's relevant in later life. I think that learning a language is far more relevant than most things. A lot of people go into different countries for different reasons, like holidays and studying. It also gives employability a boost, a lot of companies love it if you can speak a different language fluently. I'm not saying introduce it right from being an infant, but I think it would be beneficial for it to be introduced at some point during a child's first school.