I think Doncic has the potential to break the all-time points record. He hit the pedal the same age as LeBron. The only issue might be Luka's physical shape later in his career. He looks like a McDonald's customer compared to LeBron at age 39.
As much as I love Doncic's game, I don't see it. The longetivity of athletes like Lebron, Messi, Djokovic, Nadal, and CR7 is highly highly underestimated. They are BEASTS.