I think there is no way around finding a replacement player for Salah because it is not about the if, but about then when in regards to a Salah transfer. He will leave the club at some point, but there are rumors that a club from Saudi Arabia offered him a contract with an empty field, so to say he was supposed to tell them how much he wants. Who knows whether that is the truth, but I believe that Salah could be a high interest target for them because he is also Muslim and I think he could become an iconic figure for the league because of the high level of mutual identification. So either way Liverpool has to be prepared for some significant change.
Honestly, the way he is getting big offers from Saudi clubs, I am not going to be surprised at all if he actually decides to accept one. And that can definitely happen. After all, they are professional footballers and they will be playing for money. It will not hurt a player like Mohammed Salah to choose money at this stage of his career. Liverpool has to find a substitution for him and they will have to do it quickly. The relationship between Liverpool and Mohammad Salah has been really good, but every good thing must come to an end in this world. And it will. The question is will be ready for that?
That's true, if he accepts an offer that essentially nobody in this world would decline, there is nothing to say against that. There are always moral discussions about these rich players going after more and more money, but I think everyone should ask themselves what they would do when a contract would be lying in front of them with a whopping 200,000,000+ USD salary per year. It is so outrageously much money that it would almost feel wrong for anybody to take the contract and tear it into two pieces, saying that they won't sign it. Players are thinking about their families and the generations to come. Having 100 million is a lot, having a billion is a different category of wealth.
I don't think it's about the money for him, else he would have jumped at the first instance of an open check or a wage bigger than Ronaldo's.
Salah is yet at the peak of his career, he can't be compared to Ronaldo that has literally almost played in the world major leagues and with more titles and accomplishment that he, Salah can only dream of still.