Again, I would venture to answer that question, which I would prefer to avoid doing, out of caution.
In constitutional terms, you mentioned the Canadian Charter of Rights and Freedoms. The provision that concerns courts is section 19, which is limited to courts established by the Parliament of Canada, as well as those established by the New Brunswick legislature. The guarantee for Manitoba comes from another constitutional statute, as I have mentioned. That is the Manitoba Act, 1870. These guarantees are equivalent in terms of jurisprudence. The Manitoba language rights reference confirms that.
So a constitutional right to use either language exists in Manitoba, New Brunswick, the federal government and Quebec. In part III, in particular, the Official Languages Act attempts to supplement this constitutional minimum for the use of either language by adding a series of other rights.
However, one cannot necessarily predict that the situation will improve in every province. Some collaboration is also needed at the provincial level.