Ok, let's establish
LizzyM's College of Medicine. We'll accept students right out of HS provided that they've taken and scored at least a 5 in AP Chem, AP Biology and AP Physics. They'll need an ACT of 26 or higher or an SAT of 1400 or higher (only verbal and quant sections). The first 2 years will be online and we can admit thousands.
However, the grading in first year will be curved so that at least 25% flunk out in the first year and at least 25% of the original pool flunk out in the second year (in other words, at least33% of those who survive the first year). Anyone who does not pass Step 1 on the first try will be dismissed. We'll flunk out at least 25% after the clinical clerkship.
Oh, and there is no guarantee you'll get a residency when you graduate... in fact it will be cut-throat to land a spot in residency.
Does this sound like a good plan?
In the US system, we cull the herd in undergrad and admit <50% of all applicants who have succeeded to the point of making an application. But >95% who start medical school see it through to graduation and >90% of all US grads get residencies. Do we want to turn this upside down and put all the attrition in the medical school side?