You could try rooting for a team that achieved glory many years ago, but which has slipped into obscurity since: Reims. They're not even in Ligue 1 these days (though they could feasibly be promoted in the near future), but in the late 50's, they made it to the Champions League final twice- losing to Real Madrid both times. I'm not from Reims, by the way, and don't root for any particular club. (I follow Ligue 1 from afar here in the US, as a French-American fan.) But it would be nice to see a club with so much history rise from the dead, so to speak.