If you only aim for Ligue 1, I think whoever the coach will still be able to win the domestic title. PSG is very strong and completely dominates the league. So it's not wrong if the club owner, Nasser Al Khelaifi, has high targets in the Champions League. With the quality and money that has been invested I think Nasser Al Khelaifi is at least targeting PSG to become Champions league finalists. And that is a target that Enrique should be thinking about because I think he can be replaced by anyone at PSG.
PSG has long dominated Ligue 1 and there is no connection with the coach regarding competition in the league because there are no other clubs that are much better than them. What PSG needs to think about is how Luis Enrique can give something different for the club this season. Where they can compete with other teams in the Champions League because in the league the competition is much tighter and more competitive so there is no chance when they have no readiness.
With the ability of unlimited money, they might be able to make it happen but I think it takes time for Luis Enrique because building an ideal squad cannot be achieved in the near future. Patience and giving the choice of choosing the players he wants is a pretty important factor because I am sure in having the targeted player who is liked.