You're right that francophone immigration plays an extremely important role. In fact, the Quebec government is aiming to increase the percentage of francophone immigrants.
At the same time, it ties in with what I said earlier. I may have been referring to the other provinces when I said it, but it also holds true for Quebec, albeit to a lesser extent. When you have francophones being anglicized at a certain rate, no matter how many francophone immigrants you bring in, it won't fix the problem. I realize that Quebec has a lower rate of anglicization than the other provinces, but it's still something that happens in Quebec.
Francophone immigration is really part of the solution, not all of it. It won't help to put all our eggs in that basket, because of the anglicization of francophones. Whether they arrived yesterday from French-speaking Africa, Lebanon or elsewhere or whether they've been here since the 17th century—when the anglicization of francophones began—the problem remains, and immigration alone won't fix it.
That's why it's so important to fight on both fronts, but yes, francophone immigration is one of those fronts.