But we have a shortage of doctors in this country (USA) at least, due to cartel controls on med school. More doctors, modestly paid, could serve more people currently underserved.
Most people who go through the extensive training required to be a doctor want more than "modest pay" as a result, and rightly so. And doctor pay is not the cause of the high cost of health care. Doctors could all work for free and all else remaining the same you'd hardly notice the difference.
A shortage due to med school controls won't be relieved by more people deciding to apply to med school, because the numbers there are fixed. To fix that you need to get the controls relaxed.