Of course, PSG is still expected to be the team that will dominate Ligue 1 next season. Goal productivity may be a little different when they no longer have Mbappe, but considering there are still several other productive strikers, you can still expect them to dominate. Even if PSG can no longer dominate, it will be good for other teams so the title competition will be very difficult. But in my opinion, PSG will not be very different.
Luis Enrique definitely has several options to find the best center forward to replace Mbappe next season. Randal Kolo Muani might be good for that position, while Goncalo Ramos is also good. I don't see much to think of as anything negative from PSG, they'll be fine I think.
Losing Mbappe will actually not have too big an effect on PSG, because indeed without Mbappe, PSG is still relatively very strong compared to other teams that are currently competing in Ligue 1, maybe PSG goal productivity will be slightly reduced in Ligue 1 but PSG can prevent this from happening if indeed PSG can get other strikers who do have a very high scoring instinct like Mbappe so far, indeed currently in the PSG squad they still have Goncalo Ramos and also Kolo Muani, both players are actually good players and can be expected by Luis Enrique but both of them have often appeared inconsistent so far so it is natural that in every match they lose competition with Mbappe.
For next season, it is not wrong to expect goncalo ramos and kolo muani as PSG strikers, especially since the two players were quite sharp strikers at their previous clubs, but even so I hope Enrique does not take risks by not bringing in other players next season, because I still think PSG still needs a squad depth that is quite qualified and good to be able to compete, especially in the Champions League later.