I've seen doctors that are miserable and those that are happy. It's an honorable profession and the flexibility of career options is immense.
Plastics, sports medicine, orthopedic surgeon, novelists, emergency room doctor, etc...etc...
you are given the tools to use your skills to help people and are paid well for that gift.
If he goes into it for the money, he's in trouble. Because anyone that is willing to work the hours that training involves and does it for the money , might want to get an MBA and fight their way to the top putting in 36 hour stretches of work on and off for 5-7years after graduate school. There are very few corporations that will work you harder than a residency program.
Let your son be a doctor. Who knows how many people he'll help in his life? I think it would be easier to quantify than other professions.
It’s not an issue of whether he’s doing it “for the money”—it’s a matter of high malpractice insurance rates, risk mitigation that limits patient interaction, and dealing with PI attorneys- these things are ruining the freedom to treat and are driving good doctors out of the profession.