It's like all the clubs in Ligue 1 have given up to PSG as their king without a rival. If not we would have seen at least one club that would have challenge PSG and make history for themselves for once. However, the poor financial condition of those clubs is something we need to put into consideration which is one of the major reason why PSG is dominating the league.
In last decade, soccer is completely changed in French Ligue 1 no club is having enough sources to challenge PSG which is big setback for this league Qatari backed PSG spending amount which is equal to all other clubs which are playing here this is huge difference.
French soccer authorities also fail to bring any solid strategy which helps them for having something creative or realistic for this league now if any club wants to do something big investment is must for this which is not coming quality players are always key for success, but this also needs good amount or good academies which are not working around here. Quality and consistency is going down every year which is huge problem PSG is now challenging big European clubs if they go with their second team still they can win Ligue 1 easily.
This problem will not be solved until other clubs find wealthy owners. How likely is that to happen? I think it's extremely unlikely, so PSG will continue to dominate Ligue 1 for a very long time to come. It's a huge achievement for them that they finally won the Champions League and proved that French clubs can compete at the highest level.