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.