Well the opening paragraph says.... thousand would leave medicine. Later in the article it does say that many new doctors are foregoing family type practices for specialty's.
I suspect we could go to any number of professions and find the same result, those who are dissatisfied with some aspect of that career. Every year thousands of people change careers because it wasnt what they thought it would be in any number of ways. Cudo's to those who find something that fits the bill for them on all levels.