Even when PSG had Mbappe in the squad, Enrique fleet was not favored, especially next season after they were left behind by the French star. Indeed, on the one hand, Mbappe departure will make other players shine more, because in the previous season they were under Mbappe shadow. Luckily PSG has a quality manager at the moment, where PSG management only needs to provide full support to Enrique to rebuild the depth of the squad.
Therefore, PSG will still be able to dominate Ligue 1 without any worries after Mbappe departure, even for the next few seasons, I don't think PSG will experience significant pressure from other contestants. Meanwhile in the Champions League, PSG has many choices to maintain its ambitions, choosing the instant method with recruiting star players is one of them. But I think PSG would be better off doing it differently this time, they would be better off building a strong foundation with the players available, especially giving more opportunities to their young players.
Even though PSG is a rich club, they have failed to live up to expectations in Europe. I think the management ranks must receive serious attention to be improved and must be filled with people who understand the rules and targets of the club. Now is a new era for PSG to overhaul the squad after Mbappe's departure. On the one hand, the French striker is really needed, but on the other hand, he is a huge burden on the club because of his salary and attitude which must be put first.
PSG will still be able to shine under the guidance of Luis Enrique specifically in League 1, but in the Champions League it is always difficult for every team. It's just that the PSG president has to reorganize management, achievement targets and transfer policies.