If you intend on getting a good job, you are going to need a good education. In order to get a good education, you have to get that from somewhere. Colleges provide educational resources that help get degrees. Degrees help you get jobs. So yes, college is very important to a successful future.
I am confused on what you are trying to debate with. College "is" important because it is apart of the building blocks of life. For example, do you think, without going to college you can become a doctor? Why not? The answer is education. With the rising competition of students these days, going to college determines whether you have a future or not. In conclusion, college "is" important because without it, you have no stable future.