Talking about Mbappe's absence, it will only affect the team's performance in the Champions League not in League One.
PSG will remain the best team in League One because I don't think there is any other team in the tournament that comes close to them in terms of performance since they have been dominating the League One for a long even when Mbappe and other star players are injured.
Since the team has money, they should give Luis Enrique some money to shop for more players that can help the team achieve their main aim which winning the Champions League; if they don't add some quality players, they will do well in the League one, but can fail when it comes to Champions League.
They have done that, they are not even half-hearted, they are willing to spend a lot of money when they bring in 3 well-known players on the front line, but the result is still the same, they never get the Champions League title. Will Paris Saint Germain go back to doing the same thing they have done in the past and failed to give them the achievement they have been waiting for?
They are very capable of digging very deep into their pockets, because they have a lot of money at the moment. But the question is how effective would it be if they did it? Because as said, if only to dominate Ligue 1, what they have now, in my opinion, is enough to make them achieve.