Depends on what you mean by different track.
At least when I was in school, the “Pre-Med” majors were Bio/Chem/Biochem/Microbio/Kinesiology majors which if thy didn’t get into med school, most of them end up in Dental/Pharmacy/Grad schools. People who go pre-med generally prefer a study in life/physical sciences as opposed to Social Science / humanities. Most accept if they need to get a job in a lab, they are ok with it. In the end, there is still a love for science above everything else. Med School is just an avenue to put that into a paying career.
My neighbor at the dorms finished up his Bio degree and went back home to be a farmer with his dad. Even with C in bio, he was happier than switching majors to something he didn’t like.
Actually, you are right. The ones who didn’t make it were the ones who really didn’t love science. So, I guess students need to be honest with themselves.