No matter how good a player is, eventually sooner or later they will leave, I am reminded of the words "no player is bigger than the club", and what is happening to Paris Saint Germain at the moment is that it seems that their players are bigger than the club, in this case none other than Mbappe. Now will they remain in this situation? I think there must be firmness from management not to focus too much on one player alone.
As you said, they have many good players in the club. I worry if other players start to feel something uncomfortable when they see their teammates being done more special than them. Because new problems will definitely come.
PSG is paying more attention than they should to Mbappe. He is just a player and if they give him more attention than they should, there is the possibility for other players to be unhappy because of giving more attention to Mbappe than other palyer. However we saw this season in some games even without Mbappe, PSG could still win the games. Also, since his players are about to leave at the end of this season, maybe they should start seeking alternatives for this player now.
As I said before, it will invite new problems to come to them. I totally understand that they need Mbappe, but what they're doing is a bit excessive and that's not good for a club like them. By doing something like that, then they will forget about other problems that they should solve. They are a big club that has a lot of money that they should be able to utilize more.
They can look at Manchester City in the Premier League, yes they have very good development as a club, and as a result they can realize something they dreamed of all along, namely winning the Champions League.