Here's what the NBA would look like if it was geographically realigned:

Eastern Conference

Atlantic Division

Boston Celtics
Brooklyn Nets
New York Knicks
Philadelphia 76ers
Toronto Raptors

Central Division

Chicago Bulls
Cleveland Cavaliers
Detroit Pistons
Indiana Pacers
Milwaukee Bucks

Southeast Division

Atlanta Hawks
Charlotte Hornets
Miami Heat
Orlando Magic
Washington Wizards

Western Conference

Northwest Division

Denver Nuggets
Minnesota Timberwolves
Oklahoma City Thunder
Phoenix Suns
Utah Jazz

Pacific Division

Golden State Warriors
Los Angeles Clippers
Los Angeles Lakers
Portland Trailblazers
Sacramento Kings

Southwest Division

Dallas Mavericks
Houston Rockets
Memphis Grizzlies
New Orleans Pelicans
San Antonio Spurs

And you wonder why I have you on ignore...

Go look at how the NBA is currently aligned and figure out how much realignment you've done here.

Until the NBA expands to 32 with Las Vegas and Seattle, nothing makes sense unless they go conference-less. A 5x6 model with a 16-team playoff (each division getting an autobid):

Atlantic: Boston, Brooklyn, New York, Philadelphia, Toronto, Washington
Central: Chicago, Cleveland, Detroit, Indiana, Milwaukee, Minnesota
Pacific: Golden State, Los Angeles, Los Angeles, Phoenix, Portland, Sacramento
Southeast: Atlanta, Charlotte, Memphis, Miami, New Orleans, Orlando
Southwest: Dallas, Denver, Houston, Oklahoma City, San Antonio, Utah