From the article...""Ontario was very clever, too clever by half in fact," said Vern Krishna, a veteran tax lawyer who teaches at the University of Ottawa. "They made the concession, but somebody else picked up the dinner tab.""
The problem is somebody else would have picked up the dinner tab through higher taxes.  The taxpayer is on the hook no matter if they Dr's were allowed to incorporate or negotiated a higher fee for service.  How does a "veteran tax lawyer" miss that part of the equation?