This is what will happen:
We give them Coutinho + Rakitic + 35M and bring back Moneymar.
Reasoning:
Coutinho: We seem to be stuck with Coutinho. He has insane wages, doesn't fit anywhere and is not liked by the fans.
Rakitic: We are so stacked in middle, we don't need all those players. Busquets would be a better option because of his wages, but I feel he is non transferable due to his status and his relatively low market price. So, Rakitic seems to be the only one that would bring us some money, without losing any quality really.
Results:
1. Separate Rakitic from Valverde and break the Raki-Busi duo.
Instant midfield improvement.
2. Neymar's salary would be covered by Raki's and Coutinho's, so financially, nothing will change.
Shirt sales increase. Increased attendance. More income!.
3. Neymar will provide some good performances and take away some weight of Messi's shoulders.
Messi would be more rested.
4. Suarez will get replaced by Griezmann is some games.
Suarez would be more rested.
5. Neymar will eventually get injured during april and our front three will be Griezmann - rested Suarez - rested Messi for all CL knockout games.
6. Barcelona CL Winners 2019-2020
And all that because of Neymar's transfer.