I do have to agree with Cameron SS on one thing. While laws may not be changed, the courts, and the Supreme Court of Canada in particular, have the duty to interpret the laws and how they believe Parliament meant for those laws to be applied. So yes, a Supreme Court ruling can have an affect on everyone as they are the final arbiter of how a law is to be applied until and unless the law is changed due to other factors.
As far as I'm aware, the Supreme Court can have a law changed if they find that it's unconstitutional but otherwise all they do is interpret the written law to confirm how it will be applied.
Unless you live in Quebec, the courts consider precedent (called common law) and can and will apply old decisions to new cases, that's why there was so much dialogue on previous cases.
Again, I don't feel like there's going to be any drastic changes to airsoft but to say there is no concern is also wrong as well.