The only way to prevent massive failure in this program is to dumb down college courses so much that most high school frosh can pass.
But let's follow the logic. Shouldn't all middle schoolers be able to get a jump on high school by being required to take high school courses?
How about elementary kids? Why leave them behind?
And what about college frosh?
Shouldn't they be required to take at least one graduate level course so they can get a jump on earning their MA or PhD?