Neymar not playing is not really a shock. First of all he is injured so he is not ready to come back yet, and secondly even if he comes back nobody should expect him to do that great, he has been injured all his life, ever since that famous injury at Brazil years ago, he has been getting injured quite frequently. Look at his time at PSG, he was great there when he played games, but he missed more games than anyone else, he was constantly injured and constantly missing games as well.
I believe that it is going to be a trouble for him and there is really no way to recover from there at all. The best thing they can do right now would be making sure that Neymar finishes his contract there, or (I know it is near impossible) find a team to get him. Even terminating his contract for cheaper than what he is owed would be fine.
Terminating Neymar Jr contract with his current club, though he's benched for a lengthy period, it doesn't mean he's not important for the club's progress but the board have already moved on, making more prominent signings for the growth of the club. Neymar Jr is vulnerable to injuries and we should always know the level of capacity and expectations from the Brazilian. To me, It's over for Neymar Jr, he's unable to meet the required expectations from Al Hilal supporters, out of reach for the player.