As you said, it is likely that Paris Saint-Germain will not experience significant obstacles in the French League competition. although from my point of view that Enrique is not satisfied with the squad of the team he is coaching, however in this competition PSG is doing a very good job. from the 17 matches they played, none of them were defeated even though four of them ended in a draw. they are also quite productive in terms of scoring goals, although Enrique always tries to tinker with the center forward and even rotates his midfielders. it is possible that PSG can break the unbeaten record in the French League, as long as they are always consistent and play with solid teamwork. btw, I have no information whether PSG is eyeing some players in the winter transfer window this season, or they will do it in the summer. in the Champions League their status is very doubtful, their performance is not good enough. the problem is not because PSG plays badly, but more difficulty in converting every opportunity into goals. well, it seems that Enrique does not have an option for a center forward that he can rely on, that's why there are often changes. Next, their opponent is Manchester City and if they lose then PSG's chances are gone.
After all, even after Mbappe, they are the highest valued team in that league with multiple magnitudes over other teams. This proves the point that they have the best players in almost every position, which makes them win the games as well. It would be weird if they ended up not getting the wins, I am not saying that they won't have any loss ever again, it's just that they will end up with more points every year as long as they stay the richest team.
Even if other teams ever get some good players, PSG could just buy those players, or other teams in other leagues with money ends up buying those players, so no other team than PSG ends up getting their players stolen that easily, even PSG did lose Mbappe, but not many else. So that is why we are going to keep seeing PSG win the title every season.
The only way this could change could be if another team gets as much money as PSG, or if there is a reason or way where PSG doesn't have this kind of money again. Aside from these two options, as long as PSG is the richest team, I do not see how they could end up losing anything at all, they are going to end up winning every game and nothing about that will change anytime soon.