Tyler Cowen, an economist at George Mason University, has proposed the theory that learning foreign languages will be increasingly important for job-seekers around the world.
Rather than making the usual arguments - that the world is increasingly globalized, that immigration is increasing, that international trade will be more important in the future - Tyler points out that critical thinking, judgment, and empathy are increasingly important skills in a knowledge economy. In a world where these characteristics are highly valuable, the best investment in your education is not technical, but general: learning to learn instead of learning to do something.
And, in addition to dating a foreign person as a way to gain international insight he also recommends travel and learning a foreign language.
Of course, I'm a believer in learning foreign languages, foreign travel, and trying to understand the world from a global perspective, so I'll take any argument I can take along those lines!