In football there are sometimes that loses are bound to happen and despite the fact that PSG lost that game go Chelsea doesn't necessarily mean that they will be lose in their game in league 1 because with the quality and standard of that team I don't think any other team can actually challenge them for the league 1 title because they will be winners at the end of the season again and besides lille and Monaco aren't actually big team to give PSG headache.
The defeat PSG conceded against Chelsea in the Club World Cup will not have any negative impact on PSG's performance in Ligue 1 or the UEFA Champions League competition next season. Since PSG has a good coach and a good squad depth, PSG will still remain a big threat in next season's UEFA Champions League competition, and it is certain PSG will win the Ligue 1 title next season because there's no club that's capable of winning matches more than PSG in Ligue 1.