I have a few more examples - mostly because of situations I've been in over the years, and I know that the decisions get made today. Blind eyes get turned, "Oh dear, I appear to have left you way more drugs then required. Make sure they don't overdose on them." and then the death is ruled natural causes, all obvious evidence to the contrary.
I think overall this ruling is good, because it will remove the necessity for such "natural cause" deaths and ensure that the framework is followed instead. There's always going to be messy corner cases in law. There are people who get sentenced for murders they don't commit too. We can't ignore the problem because the solutions are going to be imperfect.
In the wake of this announcement there was someone who called into the local radio show. He said he had injected his loved one with a lethal dose of medication ("enough to kill a horse"). Imagine the guilt and suffering that person has gone through since, as they were unable to seek help, or therapy, etc, because what he did was technically speaking murder. We are not serving the greater good with the status quo.
The next step is for the competent government (federal most likely in this case, since the existing law is federal, although there's a non-zero chance that the feds might leave it up to the provinces through inaction) to take a stab at answering all the messy issues like "What does competent mean in this case". Then there will be court challenges, until we come up with a law that is acceptable within the Charter of Rights and Freedoms, and acceptable to the government(s) of the day. It's not pretty, but it is democracy.