Plus anything that can be done to juice the supply side of the healthcare curve is a big benefit. Cheaper school means more doctors means lower labor costs means cheaper healthcare.
Bingo. Also, even if we somehow forced all doctors to work for free and magically ended up with the same quality of care, we'd still only reduce total spending by about 7%.
That's a hard upper bound on the effects that increasing the supply of physicians can have.
No, but it might mean more doctors in the kind of practices and specialties that are socially useful but not serving the wealthiest of private pay clients, because the necessity of chasing the maximum returns is reduced.