Really? The NBA? Silver outlined a few gimmicks last year that were all wildly scorned and were not adopted except that asinine play-in tournament to see who has the honour of getting trounced 4-0 or 4-1 by the top seed. The game has changed but that's due to smarter front offices/coaches, not rule changes itself. IIRC the last really major change was the addition of the three point line. NFL...same. Game has transitioned to a passing league but not thanks to any rule changes, other than the ones passed for obvious safety reasons. The only league which has really changed itself drastically has been the NHL - major divisional realignment, the shootout, the participation point at the end of regulation for ties, elimination of center ice offside, tinkering with what is and isn't a penalty both officially in the rule book and unofficially by telling the refs to back off or start calling something more.
I suppose all leagues adopted some form instant replay and coach challenges but that should be an obvious move facilitated by technology.