I chose an aviation degree because I solely wanted to work in the aviation industry. Obviously flying is my primary goal, but if for some reason I lose my medical or cannot fly for some other reason, I still wish to remain in the industry in some capacity. Nothing else interests me in the slightest.
The course I did had a wide range of subjects, like airline management/economics, engineering, human factors/CRM and touched on other topics like Air Traffic Control and Risk Management.
As far as I'm concerned it gave me a good (but sometimes brief) overview of the entire industry through academic studies, as well as allowing me to complete my flying training in a structured manner at the same time.
If you think you might one day work outside aviation, then sure, a business/marketing/economics/engineering or whatever degree is for you. I might add that these degrees may also help you get a job in aviation, the only problem being that you might have specialised in one particular field.
TL