I'd like to see fewer teams making the playoffs. That would force teams to play during the regular season in order to ensure a playoff birth, like we see in baseball. Too often we see 7 and 8 seeds that are just bad teams and have no business playing for a championship. Also if the number of teams that make the playoffs was 6 for example, then getting a first round bye would be a significant advantage to play hard for in the regular season.
I also agree with those who stated that fewer regular season games would help too.