Mbappe is a very special player. His place will not be easily filled. There will be very few players who can achieve the success he achieved. If Mbappe had left two more seasons earlier, Messi and Neymar would have been more important players. But Mbappé is the key player this season. Mbappe's absence will affect PSG badly, but Enrique is certainly thinking about it. I think he has already chosen the player to replace him.
I don't think PSG will be concerned about Mbappe since they have enough money to sign crucial players who can help them perform successfully. But it will be difficult to get a player like Mbappe into the club now, but I am confident they will continue to dominate League 1 every season because they are the only great team in the tournament. Every season, PSG performs in the league, but they didn't get the opportunity to win the champions league with having many key players like Messi and Neymar, including Mbappe, but they didn't win the big competition, so even without Mbappe, they will still do what they are playing, but anything can happen next season since all the key players are no longer in the team they can perform more better, because some players are making the team weak and be playing weak games because even messi when he is in Psg i think they fight with mbappe and that make messi play one season and leave the club for them. let see how the next season will be and see how PSG will play but he will be very good and buy player that will replace mbappe so that the team will maintain the there performance in the league next season.