I don't know. You would have to ask the government.
I'm old enough to remember when Stéphane Dion was President of the Privy Council. He specifically asked to be responsible for official languages and that is when we had the first official languages action plan.
Let's not forget that the clerk of the Privy Council is in charge of all public servants. When an order comes from the Privy Council, public servants obey it. The order has much more weight if it comes from the Privy Council than if it comes from the Deputy Minister of Canadian Heritage, for example. The same goes for the Treasury Board, which has the power to approve budgets. If a department is required to ask for money from the Treasury Board, then we know that the department will meet Treasury Board requirements.
Accordingly, if you want the administrative or bureaucratic implementation of the legislation to be more effective, I suggest you entrust that to the Privy Council Office. You'll see that the public service moves much more quickly.