Possibly. But, for that to be meaningful for NBA Exp, a few things must also be true:
1. There's a correlation between NBA fans and WDW visitors
2. WDW is family vacation, so if only half the family are NBA fans, will the whole family go? Will they be willing to split up?
3. Even if the family likes/loves the NBA, it doesn't necessarily mean the experience will win out against LOTS of competing family activities
If I were running the place, I would not charge admission, and instead charge per activity (or package of activities). This will encourage moderate fans/non-fans to check it out, and maybe decide to try things that look fun. This will also help NBA fans convince non-fans in their family to give it a try.
Easier to convince a non-fan to check out a free to enter, than if it were $$$ to enter.