Neymar has already talked to the board about his wish to leave if I'm not mistaken. Hence I expect him to get an offer from outside Europe and to take that offer. Most probably his choice would be Saudi Arabia I think because they would probably offer much more money than an MLS team.
I also heard this news, PSG plans to release Neymar for 100-150 million as you said no European club will pay 100-150 million because he is already 31 years old this record has never happened to a European club I mean for players who are 31 years old except Saudi Pro League or MLS but so far no club has come close. I have also heard of another scenario, Saudi club will buy Neymar and then loan him to Barcelona while his salary will be paid by 3 clubs PSG, Barcelona and Saudi club of course, with a certain agreement.
This method is more appropriate for PSG because if no club signs him then PSG will pay his salary until 2025 while Neymar is the PSG player with the 2nd highest salary after Mbappe so PSG is definitely considering the scenario as I mentioned above.