That's right, Luis Enrique needs to recruit new players in the next transfer window to fill the positions left by Mbappe, Osimhen and Rahsford are worthy of being PSG main targets when the transfer window opens. Luis Enrique can update his strategy to suit the depth of the squad he has, of course it will take a little time to adapt. Meanwhile, PSG will continue to dominate Ligue 1 even though Mbappe officially leaves, they are too powerful for other teams.
Regarding PSG's dominance in League 1, I don't think Luis Enrique needs to worry too much even though Mbappe will leave for another team in a more different league. But Luis Enrique must also have time to think about who he will target in the next transfer window by preparing sufficient money. Because if the target is a player whose level is not much different from Mbappe, of course the costs that must be prepared are not small and I am sure that PSG has the ability to do that.
I agree with you for Ligue 1 PSG won't be that worried because the competition in this league is not as tight as some other European leagues which when a club loses a star without being able to get a replacement as soon as possible will really affect the team's performance and make it difficult for the team to defend the title and so on.
It's just that without Kylian Mbappe, their chances of competing in Europe might become more difficult, although it doesn't rule out the opposite because there will be a balance in the PSG squad, where no player is a priority.
The news of Mbappe's move actually started to receive resistance from several players at the club which was rumored to be his target club, namely Real Madrid, even though it was not openly conveyed, and this is quite understandable considering that Real Madrid has a very good squad at the moment.
PSG has certainly prepared a replacement for Mbappe immediately and the PSG owner certainly knows that the chance of this star staying here is almost 0%, so everyone is just waiting for news to announce his move.