Watching this discussion there is one point that troubles me: the political economy of the Pre. A Pre is a rather mysterious animal, neither fish nor foul. It hovers in the interstices between courses. It manages to delay learning for the student and also generates a tidy sum for institutions and publishers than support it.
The latest exorcism of the Pre was during the mid-ninties. High schools in this country suffered from a serious infestation of pre-algebra. Even now middle schools unable to grasp the Algebra by the 8th grade benchmark in anything but name sometimes re-invoke the Pre as an act of desperation. But the Algebra case has demonstrated that the Pre never fundamentally addressed the learning issues from previous math courses and merely postponed (most often to the detriment of the student) the learning sequence.
"Tis here, 'tis there, 'tis gone." Pre-calculus, too, is a phantasm. Is it to be college algebra or college calculus. Come on. Give the young a fighting chance. A Pre- prefix on a course indicates that either the previous course or the present course is not addressing the learning task at hand.