Salah's replacement has to be found very quickly. He is not going to give his service for much longer to Liverpool. and he has been one of the most important players for Liverpool. So finding a true replacement for him should be one of the most important tasks for right now.
Actually one of the things that affect most clubs is lack of planning, though in as much as they would already have all the kind of players they needed but planning ahead of time is always one of the most important thing because majority of clubs has been going through a lot because of the inability to have put things in place, so actually just like you said since Mohammed Salah is the most valuable and the most experienced player in Liverpool what the team management supposed to have been doing is to be striving for a good player that would replace Mohammed Salah because already the club management knows that Mohammed Salah will not play for Liverpool till he retired so working on those things now should be there number one priority because if Mohammed Salah leaves the club without any replacement Liverpool will seriously be affected before they would get use to it.