Bill Simmons had a good idea the other day:
Top teams in each conference get the overall one and two seed by record.
Top six teams in each conference automatically make the playoffs, no matter what. This year it would be Mavs, Pistons, Suns, Spurs, etc. This seeding would have ensured that none of those top four teams would have played each other until the conference finals round.
Teams 13-16 are set by an end-of-season tournament where the bottom 18 teams in the conference play a double elimination round to determine the last four playoff spots. This has three huge advantages over the current system:
1) The top 12 teams get a two week "bye week" to rest and tune up for the playoffs
2) This eliminates any team "tanking" down the stretch since fans would cool on their team who didn't try to make the playoffs
3) This would make NBA "May Madness" a killer gambling season