College admission should be offered by an examination of the student, no to every person who graduates high school. Just because you graduate, does not mean you are qualified to go to college. A student who applies themselves and has a 4.0 GPA has a better right to go to college then a student who did not try hard in school.
College is different from the public school system because it is a private industry and admission has always been merit based. Colleges accept students they think will be the most successful in their school environment, and students are motivated to study and perform well in high school if they want to be attractive to colleges. This system has worked well up and to this point, and will continue to do so in the future. Forcing colleges to accept everyone would impede competition and overburden the schools, creating a poor learning environment.