Well, there are those who are against opening up new medical schools on principle because they saw what uncontrolled proliferation of law schools did to lawyers.
And then there are those, such as myself, who believe that Miami doesnt need a second medical school, but that a rural underserved medical school in Florida would be just fine.
In any case, it is real easy to dismiss the marginal growth of medical schools because most people are very short-term minded. In the long-term, however, its not good to just open up medical schools left and right. Indeed, the Flexner report addressed the vocational nature of medical training due to the rampant proliferation of medical 'schools' in the early half of the 20th century and recommended they be closed down.
Also, while it is true the US underproduces medical graduates, this is easily made up for by foreign graduates, many of whom are willing to practice in rural areas that many Americans would consider undesireable but foreigners would love to work in. If we keep opening up urban medical schools, at the cost of these foreigners practicing in rural areas, we exacerbate the growing inequality in care between urban and rural areas.
But IMHO, Miami doesnt need a second medical school. But rural underserved Florida (northern areas perhaps?) would be fine. Unfortunately, this is just a money grab by FIU which will marginally harm us all and do little to help underserved populations (even though they state that is their mission, if it were truly their mission rather than a poor attempt to mislead people, they would have opened up the school in a rural area).