In my opinion, if you are going to school for horses, go find someone to work under. If you are going to school to major in something else and have horses as a secondary, go to school.
I was going to go to school, same situation as yourself. I got a job working for a trainer down here, and I can't tell you how much I have learned in 4 yrs. Every day, hands-on learning with someone who really knows what they're doing is worth so much more.
The way I looked at it, is that I could go to school, pay a bunch of money that I couldn't afford, take pointless classes, meanwhile participating in a riding program that I may or may not like/agree with. Go find yourself someone you admire and get a job learning hands-on. I do not regret not going back to school one bit. Not only have I learned about riding/training, I have learned a ton about veterinary care, and I've learned how to trim hooves, manage a barn and how to deal with fussy clients. I am way farther along than I ever dreamed of if I were in school.
Some professions, I believe, you need school to succeed. Some professions, you don't.
Anyway, that's my story. I don't regret not being in school. I can honestly say I'm living my dream, every day. :) Good luck though!!