Mbappe is a special player. And no one can fill the absence. Mbappe is a much improved player. He is physically and mentally very skilled, strong and he is a successful player. No other player can fill Mbappe's absence. Change is good at PSG. Even though Mbappe is not at PSG, he pushes his team to play well and do something new. One of Enrique's most notable strengths is - he is very nice and fair, efficient in managing PSG's players.
Perhaps more precisely, it will be very difficult to get a player like Kylian Mbappe back, because his abilities are above average for other players which can be the difference when he is on the field. Now it is certain that they will no longer be together with Mbappe, so Paris Saint Germain must prepare for all of that. They are actually very capable even without Mbappe, it's just that their dependence has been a bad stigma against them, bad in the sense that they might have difficulties if they don't have Mbappe.
In Ligue 1, I am sure they will continue to dominate this league, because no other team that I can see can match their strength. so they will continue to dominate the league, although I also hope that something surprising will happen, where other teams can perform well and can compete closely with Paris Saint Germain, or even they will break the dominance of Paris Saint Germain.