Apart from what you said, I think we also shouldn't directly say about a setback for the PSG team because that hasn't happened after Mbappe left for Real Madrid. Because PSG still has time to think in order not to experience a setback in its performance next season and apart from that, I also agree with what you said, PSG can still dominate Ligue 1 even though Mbappe is no longer in their squad next season.
Competition in Ligue 1 is not a problem that Enrique has to think about because however the squad they currently have is still better than rival teams even though Mbappe is no longer in their team, PSG is the only strong team in Ligue 1 so I think the season In the future, the Ligue 1 trophy will still be theirs, losing Mbappe will indeed leave a hole in their front line, but it looks like players like Dembele and Ramos will be able to cover the hole, apart from that, currently PSG is still looking for a new striker to replace Mbappe PSG in front line to next season and I think they will get him soon after the fantastic offer they made to sign the players.
Yes @arimamib you are right. I also think that PSG is going to be fine because they have enough money to bring in players. It is definitely going to be hard for them to financially recover from the Mbappe situation. They really let a player who could give them more than 200 million for free.
Anyway, why I believe that PSG is not going to have a big problem is because they have a really good coach right now, Luis Enrique. a coach who has had incredible success with Barcelona. if they actually got him A little earlier probably they could have even won the Champions League title. Anyway, You can't deny PSG still has a decent squad without Mbappé. They just need to get a player who is a genuine striker and will be able to score goals when needed.