You can’t have it both ways. Either a college let’s everyone apply to med school (and some do) and then they have a low success rate with med school admissions, or a college does some gatekeeping to encourage the strong students to apply and the weaker ones to find something else to do with their lives. But then you can’t criticize the low probability colleges- “What the heck is wrong with them that their med school admission rates are so poor” or complain that the gatekeeping colleges are keeping solid potential doctors out of the applicant pool. Pick one.
There are always going to be kids who get screened out who would have made it through, and kids who make it through who either drop out of med school, or who leave the profession entirely either before or after residency. Nothing is perfectly predictive.
But in general, I see a LOT of kids claiming that they are pre-med to either get their parents off their back for a few years (figuring that if they get into zero medical schools, that problem solves itself) or claiming pre-med because they are 18 years old and they don’t know anything about the 500 or so other interesting jobs that grown ups do that don’t require becoming an MD first.