That’s hard to say, but a number of different models would predict that effect over time, as opportunities spread to a greater number of potential players. Here is a good article from Scott Cacciola:
For a growing number of fathers and sons, the N.B.A. is a family business. This season, 19 second-generation players have appeared in games — a total that represents 4.2 percent of the league, and is nearly twice as many players as a decade ago.
Consider that three second-generation players were selected to participate in Sunday night’s All-Star Game here: Stephen Curry of the Golden State Warriors, Kevin Love of the Minnesota Timberwolves and Kobe Bryant of the Los Angeles Lakers. (Bryant, voted in by the fans, will not play because of a knee injury.)
Even more progeny are on the way. Two of this country’s top college players — Andrew Wiggins, a freshman at Kansas, and Jabari Parker, a freshman at Duke — are sons of former N.B.A. players. Both are expected to be lottery picks whenever they decide to make themselves eligible for the draft.
Players and coaches cite several factors in the rise of second-generation players, who tend to benefit from genetics (it helps to be tall) and from early access to top-notch instruction. Steve Kerr, a former guard and front-office executive, likened the setting to being immersed in a “basketball think tank” from childhood.