What happened with PSG and Chelsea has nothing to do with the league itself, it will not make PSG crumble or change, they will get the league title again. What it could do maybe impact UCL for PSG , because whatever happened there, could be something they should be caring about during the UCL period, if Chelsea figured out a way to beat PSG then it would mean they could do it again, and other teams could fix it too.
PSG is the best team in the French Ligue 1 and they will continue dominating the league until appropriate funds will be injected in another team to be able to compete them or a team acquire a lot of talents for free or reduced price.
Chelsea isn't the best team in English Premier League and they are playing better than many EPL clubs when it comes to European competitions. They are trying to return to their best days and things are going well so far. Their squad is good and can compete for the EPL title. I am not sure about Chelsea being able to beat again PSG in a future game and at the same time I don't think that PSG will hold the UEFA Champions League title for another season.