zaboomafooI'm actually a jazz trumpeter, and I do have a question for you since it sounds like you got a useless degree
Do you believe your degree will be rendered even more useless because Jacob Collier exists?
It depends on how dedicated someone is. Personally I learned great off-the-cuff chord progressions spit balling in jazz class. Everything from ii-V-i voicing, I-IV-V to ii7-V7(b9)-vi- iii7-ii7-V7-I, chord progressions, improvisation and scales were taught in music class. Personally, I don't think anyone could figure that stuff out without someone to explain the relationship between them. Yea, anyone can play a chord progression, but they wouldn't know why those chords work together.
I may be very wrong, but most of where my musical knowledge comes from knowing key relationships, circle of 5ths, how to invert chords, and someone who didn't learn it in a class room (complete with examples and staff paper) would have a lot harder time explain what and why those things worked together. Overall, music degrees are already useless, don't rely on music for a job you'll most certainly end up homeless.