Myself, I thought the big strategic blunder was when they actually put blasphemous cartoons on the government buildings.
If Macron had just denounced "Islamists," or whatever and left it at that- I think Muslims would have been divided. More conservative Muslims would have rightly been against a campaign to try to force Westernization of Muslims but liberal Muslims would have been eager to go along as they're A-okay with Westernization.
But even liberal Muslims- do they really want to be defending the insulting of Prophet Muhammad (peace be upon him). Even if they hate Islam and semi-secretly want to undermine it, water it down and turn it into a joke like much of the Christianity of today- would they really want to be seen openly defending insulting Prophet Muhammad (peace be upon him)? They would lose credibility.
If Macron had just stopped at being against "Islamic separatists" who don't believe in liberal Western values- there could have been a pitting of liberal Muslims against conservative Muslims.
Macron has gone way too far, the willingness isn't there to back up a hardline anti-Muslim campaign and even liberal Muslims to a large degree aren't going to want to help him. Even sjw feminist Muslim types aren't going to want to be seen defending this.
I think Muslims have got to take advantage of this. I think the door is wide open for Muslims to gain a victory here. Even the most liberal Muslim would be in a very awkward situation to try to defend France's actions.
I think this is an opportunity for Muslims to gain a glorious victory and I think Muslims should take advantage of it. In the future, God willing, countries like France will think twice before provoking Muslims and insulting Islam in such a way.
The cartoons, insults... these things come and go.... but the sense of unity and solidarity that Muslims can build over this.... that could have long-term effects that work to strengthen Muslims.