I think this should be decided soon, as Neymar's relations with PSG are in turmoil and his continuity in Paris seems increasingly uncertain.
Yes, he should leave whenever he gets the chance. It's super difficult to strive in negative-impact environment. With Mbappe move imminent staying back will only cause more damage to his career.
the situation that PSG is currently experiencing is indeed a little complicated because they have lost a reliable player and on the other hand PSG management is also confused about determining a policy if it will only retain Neymar but on the other hand the injuries experienced do not guarantee PSG's future in the summer and other problems it's on Mbappe's contract which is almost up and if PSG don't extend the contract soon or set a definite price in the transfer market I'm sure Mbappe this summer will just leave on a free transfer.
in a situation like this, the PSG management really relies on because if this is not resolved immediately it will make the player's performance decrease.