The thing about college is you need to be able to get a job after or there isn't any point in going. Job market for fresh graduates is EXTREMELY competitive, if you are focusing on your IM career through college and you don't have all A's it'll be extremely difficult to get a job.
What you can do is get a degree that will help you in your IM career, a business degree never hurts (extremely competitive job market). Maybe a web development class (hard), it's a really hard decision. I'm going to college right now for a business degree as I feel like it may help me in the future with IM and maybe even an old fashioned brick and mortar business.
Main point is to think long term. IM won't be same for the next 10 years, you have to adapt to all the changes or you'll be left without a job or a degree. "Don't put your eggs in one basket" is a popular saying on this forum and it seems relevant to this situation.
I don't want to take the risk of being in my thirties without a job or enough of an education to get a proper job so I am getting a degree. After getting a degree you have the luxury to still have an IM income while you look for a job, whereas your peers will not. You can take the time after graduating to get a masters to even further your chances of getting a job while you still have an income. Well, this is my plan anyways, ride the IM wagon as long as I can to further my education. After I am sure that I will ALWAYS have something to fall back on I will pursue IM to the fullest. Even if that means getting a degree I may never use, even if that means I have to work a 9-5 for 3 years making 1/3 of what I would of made with IM so I can get enough experience to get a job whenever I please.
This is probably the most HQ post I've ever made, also it's 2:30 AM so ignore any mistakes in the post

Go to college, work twice as hard as your peers, making money + school. In the end it will only favor you. You don't even need to make a full time salary, just enough that you can support yourself and your education. When you have a backup you can do whatever you want, IM, a business, music career.