The law has already determined that doctors do have a duty of care to attend an emergency even if it is not a patient of theirs-
http://www.austlii.edu.au/au/journals/SydLawRw/1996/20.pdf
Interestingly the judge at the original proceedings also found that the child's paediatric neurologist at fault for not recommending to the family the use of valium rectally for fitting even though this was not recommended treatment in Australia.A specialist from the UK was found however who testified that it was the recommended treatment.That decision was overturned on Appeal and the specialist concerned went on to become the President of the Medical Council of NSW-the authority concerned with adjudicating on medical complaints.
The original judges decision though did convince many in the medical profession that the law was very fallible.