So assuming players who are currently age 32 or older are not top 10 players(or in the league) in 3 years, who do you have as your likely future top 10 players in the NBA?
I did the cut off at under 30:
Beal, Embiid, Giannis, Doncic, Lavine, Irving,
Jokic, Kawhi (younger than you think), T. Young, Williamson, Booker, Tatum, Mitchell, J. Brown, McCollum, Ingrim, Sexton, Fox, G-Alexander, J. Grant,
Towns, Randle,
Davis, Sabonis (listed in order of current ppg).
The highlighted 8 are in my opinion likely to stay ahead of Tatum and Brown. Keep in mind that there are some pretty good player that are 30 or just over (Lillard,
Durant, Harden, Vucevic, George, Butler) that quite likely will also be in the top 10 mix for several more years.
It is not likely that Tatum or Brown will catch up with these players and be top 10 but both will be close or in the discussion which isn't necessarily bad but also not enough (think Portland who never was able to find that 3rd good player).