G. Mark’s Answer
My opinion is that getting a degree in English will help your writing. But your personal writing is not likely to get you a degree. That being said, keep in mind that a very successful writer is rare and has likely spent a lot of effort getting to that point. While a degree in English is not likely to pay as well as a degree in, say, engineering or business or medicine, it certainly has a lot of applicability in a wide range of occupations. You'll also be free to pursue your personal writing as well. Also, pursuing a degree in English doesn't prevent you from also minoring in a wide range of other fields. I personally went from medicine to engineering while taking advanced classes in various forms of creative writing, and all of that proved valuable throughout my life. Not to mention being exposed to other aspiring writers from whom a learned quite a lot and got a good perspective of the incredible competition out there.