It isn't at all obvious that he will come good actually
To be fair it depends on what you feel "Coming good" entails.
I would say that even if he doesn't get any better and continues his scoring and assist rate (8 goals and 4 assists in 1000 minutes discounting the Charity Shield) for the next 5 seasons I'd say Id call that a successful transfer for Liverpool to be honest.
Even at this point I would say that it's looking more likely he will "come good" (contributions per 90) in the end than not.
If your idea of coming good is being as good as Haaland (or the best players of his generation) then he will never come good IMO.
On a separate note ..
I love football but as I get older I have less time for the tribalism i guess.
If everyone can agree that they overpayed and that he isn't a 100m striker (at least at this moment in time) then I don't know what the big fascination is with repeatedly talking about how he isnt (and most likely won't be) a 100m Pound/Euro player.
I'm not on opposition sites but I'm sure the same things are being said about Antony right now (United did overpay to get him, he hasn't performed to the level of expenditure and it's not looking likely at the moment that he will reach that level but he still may) and I would say the same thing to them.
Enzo Fernandez had a great world cup and in my opinion the worst thing that could happen to him and his career right now is that Chelsea trigger his 120m release clause and he goes into a team that is struggling with their own footballing identity currently and he gets scapegoated for it because for 120m the fans will expect immediate GOAT level performances.