We need at least 36 to have a 32 team playoffs without letting every team in now
Houston
Phoenix
Atlanta
and one more (San Diego, Orlando, Portland, Sacramento, San Antonio, Cincinnati, Kansas City, Cleveland, Indianapolis, Milwaukee?)
But we're already at 82 games a season, down from 84. with 16 more teams in the playoffs it will be a nightmare for those teams in the conference and cup finals.
Unless they go to a 5 game series for the first two rounds (or more likely they'll do just the first) they'll need to chop games off the regular season.
The teams would very much be interested in more of a chance to make the playoffs to get that sweet, sweet playoff money which equals the revenue of the regular season for each round.