I know that many of the troublemakers are native-born citizens,and are in fact on their second or third generation as "French citizens.I am sure masses of Frenchmen in or out of government recognize THAT fact as one that makes their situation as a homogeneous culture even knottier and more intractable. The laws that need to be passed would have to apply EXCLUSIVELY to them as individuals: I am sure there are some tricky legalisms that can be employed within new Law of the Land legislation to help the deportation process. In times of crisis, nations do temporarily up-end some existing laws.
Having said all that I don't think French "lawmakers" will do anything "draconian": I think they will find a way to live with the problem and figure out ways to deal with it.
And I think that would be out a recognition that they brought this problem largely upon themselves. Massive unemployment among those groups has only exacerbated the other problems, like resistance to assimiliation. The world has never seen such good arguments AGAINST these sloppy forms of "multiculturalism" as it has in the last several years.