I'm with Flypuppy all the way.
I did a BSc at uni and although I haven't used it directly, I could use my knowledge to better understand what the groundschool instructors meant in a much broader sense.
Also (as is often said) if you are in the airline industry you spend a long time in a small space with another person. University makes you a less boring git...not that i am suggesting you are
I would say, go for it. Life is short so take it all in before you are grey and too stiff to do the things you regret not doing.
HG