I think with respect to the proposed new subsection 4.1, there is something of a danger that a provincial law might be passed that requires conduct that might amount to aiding a medical practitioner. Such a law might be found to be constitutional if it were challenged under the charter, and if so the danger is that medical professionals might be mislead by a provision like 4.1. They might feel that it gives them some right to refuse to do something, when legally and constitutionally it couldn't be a provision in the Criminal Code that protects them from having to comply with an otherwise valid provincial or territorial law.
On May 10th, 2016. See this statement in context.