For the past quarter-century, the American Medical Association and other industry groups have predicted a glut of doctors and worked to limit the number of new physicians. [1]

The problem is that the supply for doctors is artificially constrained leading to better salaries for them. If anything let's have more doctors so that the salaries are in parity with engineers.

[1]http://en.wikipedia.org/wiki/American_Medical_Association

When taking into consideration how much time an engineer has to spend educating himself and the salary he gets, it would take a while to match that from a doctor's perspective. For example, 4 yrs of undergrad and a starting job at Google can see you making close to over $100K in 3-4 years. As a medical student you have 4 yrs of undergrad and 4 yrs of medical school (that can be a tremendous amount of loans). Then throw in anywhere from 3-7 years of residency making $40K. Depending on the specialty you choose and how hard you wish to work the median salary can range from $120K to $450K.

They may not be equal, but I know developers pulling in $200K that are just turning 30. Not to mention their lifestyle is a lot less stressful.

I imagine that not a lot of people know what you can make as an engineer and too many people still don't give engineers the credit they deserve.