If we lost to France even without a bonus point we could still go through, although I would not be putting any money on it.
All the following scenarios assume that Argentina will have no problem picking up the bonus point against Nambia bringing them up to 14
If we lose to France with two bonus points, ie 4 tries and within 7 then we would just have to beat Argentina in the final game to progress. This would leave Ireland on 15 pts and Arg at 14 pts each and Ireland progressing. While this would give us a decent 50/50 chance of qualifying in a winner takes all game against Argentina, clearly this is a highly unlikely scenario for the France game.
If we lose to France collecting one bonus points, then we would have to beat Argentina and prevent them collecting either a 4 try bonus or a losing bonus point. This would be a hugely difficult task against Argentina but we would not be entirely without hope.
If we lose to france without collecting a bonus point, then we must beat Argentina and collect the 4 try bonus point while denying them any bonus points. Clearly this would not be far off mission impossible and an early trip home is very likely.
In all of these scenarios I believe France would be the group winners. [/b]