A big question here is why the app flopped in the first place. Did you bust your ass, focus on premedicine and the MCAT all through college, and then pull a 2.5 and an 18 on the MCAT? In that case I agree with you, the applicant should find something he's good at rather than pounding that square block into a round hole. I might also be fine with a high apptitude applicant getting rejected for college spanning lazieness. The issue, though, is that a lot of bad apps happen not because the applicant lacks the appitude for medical school or even the drive, but because he wasn't focused on the goal of medicine to the exclusion of all else.
Got serious about studying in your Junior year? Too late. Low GPA because you thought you wanted to be an Aerospace Engineer? That's a shame. Had to work two jobs to put yourself through school? No leeway. Whole family died and then you got cancer? Whatever happened to you your GPA and MCAT will be seen in exactly the same light as a full time, healthy student at a private school (average GPA 3.8) with no extracirricular responsibilities, no financial worries, private tutors hired by his parents, and a strong understanding of the medical admissions process insitilled at birth.
The system is designed to select for the children of doctors and, to a lesser extent, the children of wealthy type A parents in general. A lot of more qualified applicants, meanwhile, are left on the outside looking in because they made mistakes that they didn't even know WERE mistakes until it was too late. Whenever someone like that reapplies and gets in I'm all for it. Also, for those students, the hardest part of their career is going to be their admissions process.