Chinese seems like a language which will offer a lot of oppurtunity, considering the extent of modern Chinese economic power. I would assume that, if you stay with it, it should be able to help you with your job opportunities, especially if you have an interest in international business.
I, too, would be interested in learning it for this reason, but I have moral issues with supporting Chinese businesses (and, therefore, the Chinese government, which I find to be mostly covertly, and often overtly, oppressive.)
Anyways, I would disagree with post 3, as I doubt that learning either Korean or Japanese would be an easy task.