In order for students to be successful in life they must go to school and get a degree. If all students only went to school till the 9th grade we would have no real professions. No doctors,lawyers, professors, scientists, none of that. Now, students can dropout once they are 16 years of age (in Florida), but if they choose not to they can go on and be successful. You are saying that there should be no colleges and that after the 9th grade students start working and they receive no further education. The absurdity is mind-blowing. America would fall apart if we did such a thing.
We currently have a crisis in this country of recent college graduates completely unable or unwilling to find work. Funneling all students into this system as a matter of course isn't the solution. I believe that real world work experience prior to entering post-secondary education would give young adults a chance to learn what they'd like to do with their lives before accruing a large amount of debt and wasting a lot of time.
I believe we need a return to trade and vocational schools at a younger age. You see these sort of programs in European countries with good results. There are plenty of decent "non-professional" jobs that can be learned in a couple years that currently require a college degree for no reason. *That* is absurd.