I think they are already champions, that's the worst thing about the French league, there is only 1 team and every year it's the same, every once in a while a surprise team comes out and becomes champion.
But atleast, PSG has not been able to set a record like Bayern Munich in the Bundesliga with 11 consecutive trophies and thus, I think PSG dominance can still be thwarted by other teams in Ligue 1. Although indeed, quite often the efforts of other teams also fail because after all, although PSG started the season with bad results, but as the season progressed PSG was really still able to return to the top of the table with Mbappe great performance.
So, if for example Mbappe is confirmed to leave in the transfer window later, then of course it might be a chance for otherteams to win the Ligue 1 title. Because after all, it is possible that PSG will experience difficult efforts to get consistent results because of Mbappe departure. So yes, let's just wait for what will happen next season whether PSG will still be able to win the trophy or not because PSG no longer have Mbappe in the squad.
I guess that if there is an initial possibility of losing Mbappe there will be a lot of changes that will affect the decline in performance and give other clubs the opportunity to feel like they are in first place leading League 1.
But if Enrique succeeds in managing the PSG players well, there will certainly be no other club that can replace PSG's dominance.
Currently we also don't know who will replace Mbappe and if PSG surprises them by bringing in Osimhen, it is likely that PSG will continue to dominate League 1 without being defeated.
Maybe it is too much to hope that Osimhen can accept PSG's offer but for me that is also very impossible and if there is no replacement for Mbappe, the coming season will be a bad season for Enrique and PSG.