If several European clubs cannot afford to pay salaries that are too large then the Saudi Arabian League can make it happen, but rumors about Sergio Ramos are not very widespread in this League even though several clubs there have also expressed interest. Maybe in the next few weeks we will hear more about Sergio Ramos and I believe he is more likely to move to Saudi Arabia than Sevilla.
Old super star players have a high ego, no one will admit if their performance are declining due to get older and keep demanding high salary. There's no league willing to pay high salary for a popular player without good performance except Saudi Professional League.
So their options are either retire or joining Saudi Arabia, this can't be denied.
that is the phenomenon we are currently seeing. many European players no longer have many European teams who want them and eventually have to go to the SPL even with high fees.
Regarding Sergio Ramos, rumors are still circulating and there has been no final decision yet. I think he can go to Sevilla and end his career there. it wasn't a difficult decision if he wasn't thinking about the money from the SPL.
Even Messi, who finally chose to go to MLS, wasn't because of money either. some players think of the calm and comfort of playing at the end of their career. many achievements have been obtained by big players, and at the end of their career, they shouldn't think too much about it.