PSG had to bear two big losses due to Mbappe departure to Real Madrid, first, they lost one of their best players, second, Mbappe departure did not bring in little money for PSG. Now that PSG have to spend large sums of money to bring in new players, they will definitely regret their decision not to sell him immediately when Real Madrid made an official offer to bring in Mbappe.
PSG will have increasingly difficulty competing in the Champions League if they don't get a player like Mbappe, Dembele cannot be relied on without the support of other great players. He also often has difficulty scoring goals in important matches, PSG must look for players who have sharpness in scoring goals in order to provide competition in the Champions League.
This is not the first time they have lost an important member of their squad, they have felt it many times before. But they don't learn from what they experienced in the past, they seem to be able to do whatever they want with the money they have. Previously they made several approaches to get Mbappe to sign a new contract with them, but Mbappe proved that money is not everything, so he remained adamant about leaving Paris Saint Germain after his contract ended.
They should have known that they could not keep Mbappe, so they could have looked for other benefits by accepting the offer made. Now they don't get anything, Mbappe leaves and they don't get any money. They do have a lot of money, but they have to run a business too. Don't pretend that if they have money they won't do something that can give them a profit. Yes, even though the money they will receive may not be as big as what they spend, at least they can get it.