After making sure Mbappe leaves, PSG is obliged to find a replacement. The coach must start making the players independent of Mbappe from now on. In addition, they also have to buy several new players to patch Mbappe's departure. The latest options I read PSG want Osimhen, Joshua Kimmich, and Leny Yoro. They want to make a big change with those players. But it is not easy, because many other clubs are also eyeing the services of the three players.
Kimmich will almost certainly not go to PSG. He is very ambitious and wants to win the CL again, as he has often emphasized. He won't be able to do that with PSG in the foreseeable future. The team is simply no longer good and ambitious enough. PSG wants to sign Kobel from Dortmund so that Donnaruma has a competitor and has to improve because its selfmotiviation does not seem enough to get to the next level. That says a lot.
The question is anyway how long the Arabs will still be interested in PSG after all their goals have failed so far.