You'd have to ask them, Mr. Samson. That question comes up all the time, but unfortunately I don't have an answer for you. What we do know is that the Supreme Court has confirmed the right to retain jurisdiction and that it's perfectly valid to do so where circumstances warrant.
I can think of other cases where a court or tribunal maintained its jurisdiction. For example, in the case about underfunding of services to indigenous children, the Canadian Human Rights Tribunal retained jurisdiction in order to require periodic reports.
The next Official Languages Act could grant this power to an administrative official languages tribunal, if it creates one. That would allow the tribunal to retain its jurisdiction, remain seized of certain cases, and require periodic reports. The House of Commons has the power to write that into a bill, and I encourage you to do so.