You're putting in a lot of hard work to get that medical degree. Then you will work very, very hard as an intern and resident. What if graduates of foreign medical schools could be brought in to work at lower wages?
They can. Unfortunately, many residency programs, as well as the USMLE create artificial barriers to their successful employment (medicine is little more than a union). This summer and past fall I worked with an Iranian-born surgeon who attended medical school in the UK. Despite scoring a 99 on his american licensing exams, he is having trouble finding employment. It certainly is a boon for American born students who don't have to meet the same benchmarks, but it hardly seems like its in the best interest of their patients.
Suppose that the medical field operated in a less restricted market, and more foreign-trained physicians could enter the field. You're right that if they worked for less pay, then physician reimbursement would drop, and health care costs would be (slightly) reduced, without a reduction in quality of care...in fact, more likely an improvement in quality of care. It certainly wouldn't help me, as an individual with a clearly invested interest, but it would certainly be of benefit to society as a whole. And if the reimbursement rates dropped, then smart people who otherwise would have been doctors will go into other professions: dentists, lawyers, PhD's, engineers, etc... where they will be more lucratively rewarded.
Besides, since when is competition a bad thing? By your same train of logic, we should prevent the importation of foreign produced products. If Honda weren't allowed to sell cars on US soil, clearly General Motors would be better off. Without needing to worry about producing quality products at an affordable price, they would be virtually guaranteed people to purchase their products. Sounds great.
Also, in your original blog post, you talk about how "An engineer who designs a new products creates jobs: secretaries, product testers, factory workers, people to market the product..." really? I don't think an engineer gets his/her own secretary, and the product testers and factory workers are likely located in Malaysia or Taiwan. It may create marketing jobs, but do we really need more people to go into the "sales" profession?
My father is an electrical engineer (and he has had his own secretary in the past, incidentally). Just to cite a concrete example, several years ago he designed a new, state of the art product. Sales went up. People in the factory (located in the US, fyi) couldn't work enough overtime to meet demand, and the company hired more people to help build the products. Furthermore, the company hired 2 additional engineers to help with R&D. At his current employer (also with factories in the US), things aren't much different.
The same is true for numerous other professions. A surgeon can't exist in isolation. Consider a simple total-joint-arthroplasty. There are multiple nurses and tech's in the OR with the surgeon, not to mention those in pre-op and post-op. An anesthesiologist is required for the procedure. People are employed to clean up the room after the surgery, to manufacture and sell the prosthesis, people paid to bill for the procedure, people involved in the supply chain that got the prosthesis to the hospital...and secretaries to schedule the surgery, schedule the blood donation, coordinate the OR schedule, etc....