Agree. Salah has a big role, Liverpool will decrease their attacking power significantly if Salah is leaving Liverpool. We must remember Liverpool performance is decreasing a lot when Mane left the club. I can't imagine if Salah leaves Liverpool, too. I doubt if Klopp can get a proper player to replace Salah's position. Klopp even failed to get a proper replacement of Mane.
It is true that Salah has a huge role in Liverpool; yet Salah is an old winger and would be replaced soon by Liverpool anyways
The best opportunity would be to let go while making good amounts of money fit to get a quality replacement in the mold of Mohammed Salah.
Mohammed Salah without doubt is a very important member of the Liverpool squad as his contributions to the club's success over the years cannot be undermined but if he decides to leave the club at the end of the season, there's every possiblity that Liverpool are gonna find a good replacement for him. Since Sadio Mane left the club, Liverpool have not been as effective as they were when he was in the squad but I don't think that'll be applicable to Salah if he eventually leaves.
Salah is reported to have received many offers from different Saudi clubs but is still weighing up his options before making his final decision.