I think learning is learning so it does not matter where it happens. The only disadvantage with dropping out of college is that you will not get a degree. If you need a degree in your chosen field to gain entry, then you need to stay and finish your degree. For example, I am a public school music teacher and I needed a degree and a credential in order to be able to teach in the public schools (and most private ones as well). I am also a composer. Now I learned a lot in college, but I did not need a degree to write music. In fact, my recommendation to those who want to pursue a music career other than teaching is to not get a music degree, but study privately with the best people you can find and afford. Then spend the rest of your time practicing your craft. I think getting a degree to be a performer or a composer is actually detrimental. Spend your time practicing, not taking classes to meet a requirement that has nothing to do with what you want to do. It all boils down to what you want to do and if it requires a degree to do it.
What do you think?