i think her point was you cant just learn language at degree level without putting it into some kind of context. its perfectly valid to do a degree in languages without literature and study other stuff that actually interests you, like linguistics or music or politics. you just have to research what the unis offer very carefully. personally i think literature is overrated, but i never have been a big reader. if it interests you than many languages like french and spanish have a rich and varied literature that is well worth investigating, but its no big deal if its not your bag. as you say its worth giving it a go, but if like you you try it and like me remain uninspired you can just turn to a different area of the language.
as for courses like business and french etc, it depends on the uni and the degree. for example i know people doing joint honours in language and business or linguistics or whatever, and this way, they have to do 60 credits of one and 60 of the other (or anthing up to a 80:40 credit ratio). for the language part of their joint honours, 20 credits of this are language, and the rest you can make up from course options such as film, literature, music, history, linguistics, politics etc. so you could just avoid literature. it depends on how varied the courses offered by the department are, and what rules they have. i do joint honours french and spanish so similarly, i only have to do 60 credits of french. if i was doing a single honours french degree, where at least 100 credits were from french, it might be more difficult to make the credits up without having to choose at least one literature course.
and also the literature offered in many unis isnt necessarily "ancient". in manchester you can study literature from the middle ages to the modern day, chosing which period interests you. i know someone at cambridge soing french and she said she had to do a lot of lit, especially medieval stuff, if that doesnt interest you then cambridge probably isnt your best option. its the fun of shopping around and looking at prospectuses choosing which uni would suit you best.