Al-Hilal actually are very disappointed with their bet on Neymar and big money spent to this player while in return they got very limited contributions from him. With latest things around Neymar, chance for him to return to Europe is very small too and maybe he will have to look for another club in Saudi Professional League or return to his home land Brazil to play very last seasons in his career.
As happy as a club is to get a star player, it still can't cover up the disappointment towards its players, especially since there is no insight generated from the player on the field. I often see Neymar on social media actively attending an event and many comment on whether he is seriously injured or not because if he is in bad condition he should be able to show more respect to Al-Hilal and this seems like an arbitrary act.
In the Saudi league alone he has no control to play the match let alone return to Europe and it feels very impossible. The most realistic thing for him is to retire after making a lot of money here, even if he returns to Brazil no one can pay his salary and besides that it will only add problems for the team he is defending and I don't think that's good.
Neymar is often injured and it is bad luck for Al Hilal because they have to accept the fact that Neymar has a long injury. The club certainly has not received any benefits from the expensive purchase. But if he can fix everything after recovering, he can still get a place in the team.