There are already plenty of French Jews who have seen the writing on the wall.
When I was in Israel last, I heard stories of families who have moved to Israel, with the husbands commuting to France from Israel to mind their businesses. The moms are with the kids in Netanya, Ashdod, Jerusalem, etc.. and the fathers spend the work week in France.
This article from Tablet magazine talks about the current situation for Jews in France.
"Growing fear", I think is a bit of an understatement.
Islam is getting bigger and stronger in France and therefore, Jews certainly are justified in having a "growing fear".
So-as distasteful as it may be to once again for Jews to have to pack up and leave their "home" country-distasteful is certainly better than dead. And economically slightly more challenged in Israel is better than dead as well.
(Still, Israel's economy is booming-and France's sucks dog balls, so there's that...)