Talking about Neymar's future career I think that even Neymar himself does not want to think more about this especially with the crazy salary conditions in Arabia during his contract then indeed in the end there is one more Brazilian player who disappeared from the radar after Hulk, Oscar, Pato and Willian who previously took a path almost similar to Neymar.
Going back to reviewing Neymar, if you see Neymar interview regarding his reasons for playing at Al Hilal, will make us think again that it's not just about the big salary, but the attractiveness of Ronaldo and several other players like Benzema and Firmino also made him want to play in Saudi Arabia. So it's quite clear in this case that Neymar indirectly said that he was motivated to be able to fight against the star players who had already moved there. You can look for it yourself regarding the interview that Neymar delivered.
But if you're interested, I'll watch it here:
https://www.youtube.com/watch?v=pQn_Xrs9spE