It shouldn't be GOAT, it's more accurate to call it GOHT, greatest of his time. Funny how most things we consider the best, from music to movies to sport, it's what we grew up with that we consider superior.
Wilt Chamberlain was the greatest player if you look at particular individual seasons, I mean he averaged 50pts 25rebs in a season ffs, then led the league in assists for a season just to prove a point.
Kareem then had all the people who grew up in his generation saying MJ will never overtake him, he's a guard, the big man still affects the game most.
Now it's just been passed down to people aged 35-50 who now say Lebron can't pass Jordan, 6-0 in the finals.
In 10 years time if someone like Zion becomes otherworldly and is the player of his generation people wont be comparing him to Wilt, Kareem or MJ, it will be Lebron, because all the kids who are currently under the age of 20 now only saw Lebron, and the cycle will continue.