TBF if get 80m for him, that would be great business..
Kid has got abilities, but that "first touch" is still the issue and that's something he will never improve, considering the experience of Sterling and many others. Which means that year-by-year his price will reduce and also, unless we decide to downgrade after Haaland or something, he won't ever be the player ready for the starting 11..
Cause he won't ever be as good as Haaland or Aguero for the CF role.
And he won't ever be as good as KDB or Foden for N10 role..
So what's left ? Being a regular squad player, playing here and there, getting decent minutes and contributing a lot, but that's something replaceable (Gabriel Jesus, Mahrez, Sterling, Gundogan, etc.), we have easily replaced such players in the past. Well... maybe Doku isn't great than Mahrez, but Alvarez is better than Jesus, Guardiol is better than Laporte, Kovacic has contributed and replaced Gundogan on an OK level. Even though we lost Cancelo, Mahrez, Gundogan, Laporte, Fernandinho, Gabriel Jesus, Zinchenko and Sterling AKA squad players, we still managed to replace them so, that won a treble once and this year we also had that "treble run" and we failed not because of our bench strength, but because of the lack of luck..
So if he goes for 80m, I'm sure club will replace him. I don't know, maybe Oscar Bobb will get more minutes and prove that he is the player. He can play False9 and has played this season, he can be used as N10 and he can play RW. He is 21 this July and probably wants more game time, which ain't gonna happen if someone isn't sold and if I had to choose between Julian and Oscar, this year I would definitely choose Bobb, cause Bobb can be the next Foden and Julian I think has already shown his limits, capabilities, etc.