While I'm not a fan of expansion, I think we could easily see two more west coast teams get added and get to 8 4 team divsions. Divisional games mean more as 4 out of the 8 spots are giving to divisional champs.
Why not add a team in Portland and a team in Las Vegas. Then your new divisions:
Northeast:
Boston, Ottawa, Toronto, Montreal
LEftovers
Buffalo, Pittsburgh, Columbus, Washington
East Coast:
NYR, NYI, NJ, Philly
Southeast
Atlanta, Florida, Tampa, Carolina
Central:
Detroit, St. Louis, Chicago, Nashville
Southwest:
Dallas, Arizona, Las Vegas, Colorado
West Coast:
Portland, Anaheim, San Jose, LA
Northwest:
Vancouver, Edmonton, Calgary, Minnesota
Why not add a team in Portland and a team in Las Vegas. Then your new divisions:
Northeast:
Boston, Ottawa, Toronto, Montreal
LEftovers
Buffalo, Pittsburgh, Columbus, Washington
East Coast:
NYR, NYI, NJ, Philly
Southeast
Atlanta, Florida, Tampa, Carolina
Central:
Detroit, St. Louis, Chicago, Nashville
Southwest:
Dallas, Arizona, Las Vegas, Colorado
West Coast:
Portland, Anaheim, San Jose, LA
Northwest:
Vancouver, Edmonton, Calgary, Minnesota