The power of a club is absolute, but if later Enrique expects Neymar to stay at PSG, of course that will be a serious consideration for next season's competition. I think that even if there was no Neymar, PSG would still win the Ligue 1 title and they would still need new players to enter a more difficult competition, namely the champions league. At the moment PSG have not had many rumors regarding the players they will sign in the summer and I think they should do it soon because a team like Lens will be one of their competitors in Ligue 1 next season.
I see Luis Enrique and Zidane are both near to PSG and they still didn't officially say anything about their new coach.
Zidane is a successful coach and he had a good performance in Real Madrid when he was working there but he didn't work in other teams I think Enrique on the other hand because of the tactic he usually uses can't be a good option for PSG.
Also, doesn't really matter if Enrique wants to work with Neymar or not because the Neymar we see recently in PSG is far from what we saw in Barcelona.