So that would be a better idea, you are not looking to replace salah on his peak, you are looking to replace salah who will be terrible in a few years for a Liverpool team looking for prime salah times. That's why getting a younger player who is worse than prime salah, but better than salah in a few years is the way to go for their future and development.
Having Salah till next season is not suppose to be, I mean the player have tried his best for the club and his achievement for the club and how long he have stayed is a big sign for him to say it's time to go. I agree with about getting a younger player to replace him and Anthony Michael Gordon from Newcastle is a better option, thought Liverpool are eying to get his signature and they should go for him as soon as possible. They can release Salah if he refuses to leave because if Mo stays he won't be as effective as he used to be rather he'll only become a problem to the other players in terms of supporting the players to mark, so letting him go is the best choice.
And Liverpool don't need a player that would be better than Salah in years to come but someone the new coach can start his project with, after all they have bucket loads of young stars who have been there waiting to fill in the gap but if they don't think players from the academy can't perform like they want I'll still suggest they go for Anthony Gordon, he's a better players to replace Salah.
Barcelona fell a lot because they started to think that they needed to put only young players in the team and as a consequence of that wrong decision many good players will leave Barcelona. I hope Liverpool don't make this big mistake. salah played 32 games last season and scored 18 goals, that is a great contribution to liverpool, if they sold salah then they would be taking the risk of having a new player who would only score 10 goals, see the case of anthony gordon who scored 35 games (he played more games than Salah) and only scored 11 goals. Liverpool wants to win the title, they cannot afford to sign new players who score few goals, because that would mean that Liverpool would not even finish in the top 4.