Essentially, referring once again to what the courts have said, the ministries of education can give the school boards the responsibility to make that decision. If people want to attend French-language schools, they can do so. That is also the case in Ontario. Admission committees make decisions about individuals who are not rights holders. Governments can do that and most have done so, either by delegating that responsibility or by adopting policies based on section 23 criteria to extend that right. For example, if someone isn't a Canadian citizen but is French-speaking, they could be eligible. So there is a framework for the criteria.
Further, the federal government must base its funding on everyone, including both rights holders and those who are not rights holders but are granted permission to attend French-language schools.