I'd also point out that if for the sake of argument that was your primary goal at college, college is a very cost-ineffective choice. There's plenty of non-college ways of doing that, for way less money, since it's something that business people have to do routinely. Even if it means taking languages courses from the local community college on the side... I'm not aware of much evidence that major colleges teach the courses all that much better or indeed even differently for languages.
You would be surprised how much you could learn on your own!
My case it was german. I was so fascinated with the german language, and germany as a whole, in part I must sadly admit because I was such an avid fan of WW2 history. I actually tried to go the traditional route, and I hated it. I noticed one time some germans playing counterstrike and other MMORPG's I was playing. I got to know them better, in part because of their extreme delight in my ability to say a few things in german. Then it turned into ventrilo/teamspeak sessions, which then turned into me wanting to read actual german books, then it went on to learning about Otto Von Bismarck, German Reunification, the East/West cultural divide, watching foreign german films such as Der Unterfall, Das Leben der Anderen, Good Bye, Lenin!, effects German engineering such as Gottlieb Wilhelm Daimler and von Braun, which led me down the path of looking into german businesses, especially the ones that are here in my own home state (which are many), it was so much fun!
edit: I realize you qualified it with 'business' people, implying they won't see the value of learning the other things, but since business people is a large group (of which I myself can be considered a part of) I imagine there are others like me.
I've been learning some Korean in my spare time and I feel pretty confident in my assessment that being in a college course would both be easier and see me make more progress more quickly.
My good friend has a PhD in Chinese, (yes that is actually a thing), and he attests to the fact that he didn't grok the language until his travels and studies there, being immersed.
Now typing this I realize we may be debating across each other, because even if you believe you can learn on your own better, or having structured courses is better, the real answer is none of it sticks unless you fully immerse yourself in it, self-taught or not.
You might be able to reach similar levels of language proficiency without the courses but the biggest problems are 1) finding hours and hours a day to drill writing characters and other mundane aspects of learning 2) guidance from an instructor who can tell you whether things that look/sound right are. And also I think a university course also gives you a survey of the literature and culture of that language and insight into it that would be hard to acquire on your own.
Also how long have you been studying languages? I ask because I am curious if you think that the web, and later, apps, like Duolingo for example, can make a huge difference versus the pre-web era of language learning. Pre-web, I would agree with anyone that yes it would be extremely difficult to learn a language on your own unless you had traditional schooling. But today there is nothing a traditional course in German could give me that I couldn't get from Deutsche Welle, for example (but I also realize there isn't a 'Deutsche Welle' for every language).
Sorry if this is going further than you wanted, I am just trying to get different perspectives and it seems like you have a good grasp.
I started studying in middle school. I haven't tried the online stuff you're talking about. I'm not sure that they would be just as good.
If while you are there, and are aware of any similar websites like that for any other language I would love to know!
Also, I think people are fundamentally missing the comparitive here. My claim is not that learning humanities is "easy". Nothing worth doing is easy. My contention is that it is easier to learn math, engineering, and science in school and study humanities on your own that to learn humanities in school and then try to break into math, engineering, and science on your own.
And as I watch the conversation flow here, bear in mind I do mean "math, engineering, and science" here and not just "programming". Which is easier to do on your own, learn Japanese from scratch enough to get a relevant job, or learn biochemistry from scratch enough to get a relevant job? (Note we're also discussing "learning Japanese" as an extreme in the humanities but I consider "biochemistry" an average sort of what I'm talking about.) And part of my "easier" also encompasses the fact that life is a lot easier when you have a job and a paycheck. Someone who actually has leisure time due to not working two-and-a-half jobs and who is much more relaxed about paying off their loans will find it easier to spend their leisure time learning things.
In the real world that's a completely wrong way to look at the purpose of life and education, but in the small minded narrow constraints of the article its actually "correct".
A side issue is outside bubble areas, every low paid service industry worker has a liberal arts degree and they guarantee the ROI of self taught foreign languages or liberal arts will be zero. A guy looking for employment who merely is a lifelong expert on Japanese will never get hired if the competition is ten baristas, bartenders, and real estate agents all with bachelors or masters or PHDs in Japanese Literature.
However, to argue that a young person of modest means should study the humanities is just cruel. If your family and connections aren't going to set you up as a company vice president or send you to the legislature, your job prospects are dismal.
Nonetheless, I have achieved a level of fluency and especially literacy in Mandarin that puts my Japanese of that time to shame and I have no formal credential backing it up.
You don't need formal classes to become fluent in a language. If you'd like to learn how some very successful language learners have done it, check out http://lingsprout.com/experts
However, if you have two interests then gathering credentials in the one which can make more money is probably a better investment.
Of course, all of these numbers are complicated by "salary of graduates" versus "salary of graduates employed in field".