No, it's because large parts of the hippocratic oath are outdated and involve refusal to teach medicine to those not in the fraternity, and refusing abortions.
In the UK, this has been replaced by Duties of a Doctor, which is much more progressive.
Like I said, not killing people is so behind the times :D
Of course, perhaps there is a bit of concern people may have when the person holding their life in their hands no longer takes an oath to preserve it, but what did the ancients know?