I personally believe that Paris FC will survive this season, though they must improve their rest-defence.
They will survive because they were able to beat teams that for sure will go down, like Metz, and maybe get some more points from other teams hovering around relegation but now they are a standings team, they are on par with Lorient, which was anyhow the actual Ligue 2 winner.
Probably a team to bet on over 2.5 goals as they reach that target comfortably 4 out of 5.
Last year, PSG also had a difficult start to the season, and if you remember, they played very poorly in the Champions League, and at one point there was a danger they wouldn't even make the top 24.
Their start was quite the same, 3 points from the first round, and they played much better in the Ligue, they were undefeated for 30 rounds not for 4 like now, then in CL they lost to Arsenal, now they face Barcelona, again Bayern like last season, so it could go even worse downhill this season.
I doubt they would be able to repeat the CL performance but the Ligue title is still safe.
Bookies have no issue with the last game, still 1.15 against Auxerre.