SCC can't "change" law at all. They can only enforce it as per interpretation of the government issued policies. They can "strike" a law down based on the legal definitions of that law in regards to its constitutional application.
Nothing in this "ruling" is new. And if you think this is contrived you should look at some bylaws around the country. In Ottawa by application of the cities definition of "firearm" a nailgun is prohibited from discharge with in city limits!
"The hydrogen economy car from the people who brought you the 'Hindenburg
'" - Glen Foster
Condoms do not guarantee safe sex any more. A friend of mine wore one and was shot by the woman's husband!