Lionel Messi have more contribution this season and helped PSG win on several crucial games but he can't give PSG fans more expected like winning Champion League. For winning Ligue 1 seems is not matter has Lionel Messi or not I think PSG always dominance with domestic league but fans expected with Lionel Messi can get better achievement in Champion League. If PSG can't extended for Lionel Messi contract I don't sure will bigger loss because still have Neymar and Mbappe.
But PSG have few weeks for discussing back with Lionel Messi contract and accepted his offering salary, but depend on PSG or Lionel Messi its self will accept with new offering from PSG or returning back to Barcelona next season.
UCL was something they didn't get before Messi, and didn't get later on neither, that means that Messi is not the reason why they failed to win it, but they didn't win thanks to him neither, that's the difference. I feel like that means we can't blame him for not winning it, but we can't thank him for winning neither since they didn't really have much change since he arrived.
Aside from that one Lille year, they won the league and lost UCL before messi, and since then they won the league and lost UCL since he arrived, so he didn't really had a huge change in the team neither. This is why he is a great player but they need something else. I keep saying that it is manager that they need, a proper one that had UCL experience before, and I mean a lot of experience there.