expansion means realignment - there will be four four team divisions in each conference
i believe we should be advocating for "something like" the british soccer system, grouping teams with similar budgets, talent.
so, in the west, kings drop out of pacific division and are aligned with portland, seattle and las vegas (and each plays the others SIX times annually - made up for by playing east teams not twice annually, but once annually, alternating home/road). you can call it the northwest division (although vegas IS a stretch)
the rest of the pacific stays the same, call it the "Big Money" division (Warriors, Lakers, Clippers, Suns)
I really doubt that the NBA will make a consideration like that over a very obvious geographical grouping. With Seattle and Las Vegas being the incoming teams, the two westernmost divisions would certainly be:
W1) Seattle, Portland, Golden State, Sacramento
W2) Lakers, Clippers, Las Vegas, Phoenix
Things get a bit messy after that. I feel like the inflection point is Toronto and whether they pair more naturally with New York, or with Detroit.
If Toronto-Detroit, I think everything falls out pretty cleanly:
E1) Boston, New York, Brooklyn, Philadelphia
E2) Toronto, Detroit, Cleveland, Washington (this one is a bit weird, but it's the only one possible)
E3) Indiana, Chicago, Milwaukee,
Minnesota (here Minny has to be the team to switch leagues)
E4) Charlotte, Atlanta, Orlando, Miami
W3) Utah, Denver, OKC, Memphis
W4) New Orleans, Houston, San Antonio, Dallas (keeping the three Texas teams together...if you swap Dallas and Memphis it probably tightens up the geography a bit but that's a tough ask for me)
However, if you pair Toronto-New York things fall out differently:
E1) Boston, New York, Brooklyn, Toronto
Is obvious but then things get difficult.
E2) Philadelphia, Washington, Cleveland, Detroit (again, a bit weird like E2 above)
Then E3, E4, W3, W4 are exactly the same as above.
Maybe the best Toronto-New York solution is unlikely because it involves moving THREE teams across conferences:
E2) Philadelphia, Washington, Charlotte, Atlanta (for me, least weird E2)
E3) Cleveland, Detroit, Indiana, Chicago (for me, best E3)
E4) Miami, Orlando,
New Orleans,
Memphis
W3) OKC, Dallas, San Antonio, Houston (for me, best W3 with all three Texas teams and OKC)
W4) Utah, Denver, Minnesota,
Milwaukee (this is really no worse than any other Utah+Denver division, no real great options there)
I might like that best of all, but moving three teams is tough.