I'm gonna go against the grain here and say that the NBA should do everything to increase scoring.
Add a couple digits to every score. 3 pointers now count as 300 points, free throws count as 100 points, etc.
Add a 400 point line close to half court.
Add additional baskets on top of the current one, just like in the MTV rock n' jock games. 2nd tallest basket gives a 2x mutliplier, and the tallest gives a 3x multiplier.
A player could score a whopping 1200 points in a single shot with these rules.