I have to question whether the learning is productive thought; I live with two arts students who study poetry, and as far as I can tell,
learning is just writing down random shit on a piece of paper every 4 weeks.
Uni is a lot more than "Person In - > Job Out". It's not just a job factory or a place to equip you with trade skills just for a particular job, if you want that and if you don't want to (arguably) think (broadly) at all, then a TAFE might be more your thing. We have this perception in Australia that uni's are just job factories and thats all. They're clearly not, people often say that you don't use 95% of what you learn in your uni degree in the "real world" like learning it in the first place was a bad thing.
Creativity is extremely important, broad knowledge is very important. Knowing technical skills with only get you so far, you'll only be able to produce and excel so much. It's only once with creativity and innovation that we see massive gains in productivity and fundamental shifts in society. It's that kind of broad knowledge and 'useless' learning that'll get you there 99% of the time (not specifically to arts but all fields).
Think about it, in science, if you just know how to mix and prepare samples, just all the really practical stuff, you're a lab technician/monkey. If you have broad knowledge and all the things that come with that you're a fully fledged scientist/researcher/whatever and most definitely not a drone. Just in terms of looking at it through an economic perspective, with things like innovation and productivity, this is clearly a good thing.
Theres nothing dirty about learning just for the sake of increasing your own knowledge, anyway, in the process you usually pick up skills of some kind or come out of it with a better informed world view. Remember, at tertiary level, you become a semi-expert in your field, you become part of the intelligentsia. If no one learns history, what happens to our knowledge of it? We're partially the custodians of knowledge at this point as well. A better educated population (yes, even in something like arts) is usually a more productive population on the whole and a more informed population (look at some of the average voters out there, imagine what help an education would be in a lot of cases).
A long time ago, we might of been having the same debate about how finishing high-school was useless. Indeed, up until fairly recently, a fairly huge proportion of people didn't even get that far. We're obviously better off for having more high-school graduates though, just in the same way we'll be better off as a society for having more university graduates.
[I'll just leave this here -
http://www.youtube.com/watch?v=57vCBMqnC1Y ]