I think the official languages in Canada would be better served if Parliament actually implemented realistic ideas.
Some things we definitely don't recommend. For example, after Thursday's announcement at Queen's Park, we don't recommend that you transform the Commissioner of Official Languages of Canada into an ombudsman. Nor do we recommend that you try to amend Bill 101 in Quebec. You are the politicians, but I don't think these options are likely to produce results. That being said, your question elicits two answers that might help you.
First of all, there is obviously a connection between spaces at majority schools and those at minority schools, and sometimes you can help the one by indirectly helping the other. I'm unfortunately not familiar with the situation in Saint-Laurent, but I know perfectly well that, if more spaces were opened at French-language schools in regions outside Quebec, whether in Ottawa, Toronto or in the west, that would help repatriate francophones who are enrolled in immersion and who should not be there. That would thus create spaces in immersion classrooms and thereby reduce waiting times for immersion. In other words, a concerted strategy focusing on minority students and majority students seeking immersion programs would be helpful outside Quebec.
What about the situation you mentioned? I admit I don't know.
Lastly, you said that education was a provincial jurisdiction, but that's not the case with regard to education from kindergarten to grade x, that is to say, at the primary and secondary levels. The Constitution, rightly or wrongly—rightly, in my view—has created a third level of government such that, for reasons of management and control, the province may not do what it wants with respect to French-language schools, whether it be in Moncton, Halifax or Vancouver. This schools management prism didn't exist in 1988. The Supreme Court of Canada recognized it two years later. Consequently, it's absent from the present Official Languages Act, from part VII and the other parts. This must absolutely be a focal point in any revision of the act.