The first thing that is clear is that Mbappe seems reluctant to extend his contract but he is also still hesitant about leaving PSG and playing with another team like Real Madrid.
I think it is only good and right if PSG does not renew Mbappe contract; i think in my own opinion, PSG should fulfill Mbappe wishes and end this dilemna; how? by january, PSG should let Real MADRID bid for Mbappe and buy him off (such that when the summer comes, PSG Do not lose him for free). Any thing other than that then it is disadvantage PSG.
I think the league performances will improve and PSG will have no problem retaining their title.