I've been thinking a lot on this topic.
Many here seem to avoid the scientific definition of a mental disorder because of the stigma. It seems they say, "X is a mental disorder. I don't like having a mental disorder. Therefore X must not be a mental disorder." So let me play the same game below.
If GID were removed from the DSM on the basis of it being a physical/medical condition, that would mean people with GID would have to seek out a medical solution. Let's also assume the only medical solution seems to be hormones/surgery, etc.
This means if the person doesn't want the accepted medical solution, he is stuck without treatment. He cannot go to a psychologist except for generalized depression, because the psychologist will no longer consider his GID a mental disorder, and just continue to refer him to a doctor for surgery, etc.
It means someone like me, or someone who wishes to not transition to any degree, will be left out in the cold, unable to obtain treatment. It also means that fewer psychologists will be researching new treatment methods (that don't involve transition) for GID. After all, why research something not in your field?
It also means that anyone who recognizes they have GID will feel the only way to treat it is to go through the surgery, but we know that not everyone with GID needs complete transition to feel happy and in fact, some even regret it.
We are unnecessarily pigeon-holing a "cure" if we turn it into a medical condition. Most doctors want something they can sit with you, run a test, determine the diagnosis and prescribe a treatment. They aren't going to help you if you don't follow their accepted treatment regime, and they most likely aren't going to help you with the mental component of this condition - which brings us back to the psych.
Anyway, I'm not really worried about it happening this way because by the current definitions of what it means to have a mental disorder, GID fits the bill. Stigma or no, it ain't gonna change unless one of two things happen:
1) The current definitions of mental disorders changes in such a way it doesn't include issues that are pervasive, cause distress, and are different than the society norm.
2) An incredibly accurate medical-based test is developed for the determination of GID, and a one size fits almost everyone medical solution is put into place.
I say fat chance to the first one, but the second one could come in time. Until then, expect to remain "crazy".