I'd say the odds of 3 divisions is negligible because that was absolutely the worst era of modern hockey. Especially in the West the divisions were artificial, two had boundaries that spanned 3 time zones. The only good thing was that there was 8 games a year against your division which is real rivalry, NBC got to pump a lot of Chicago-Detroit, but the time travel in intra Conference games was brutal extending 4 time zones in the West multiple times per season. Playoff format was grossly unpredictable, having Detroit travelling to California, vice versa.
The thing is, the OLD OLD four-division format was fine for the Eastern/Central teams because the league was so much smaller...
Detroit played more games in the PTZ/MTZ this past season as members of the EASTERN conference (6 PTZ, 4 MTZ), than they did in 1989 as members of the WESTERN Conference, (aka Campbell then): 4 at EDM/CAL, 3 at LA/VAN. Just because SEA, VGK, SJS, ANA, COL, ARZ didn't exist.
Doing 6x6 with 36 teams is a very bad idea.
A. We just don't have organic groups of 6 like that and you're cramming square pegs into round holes.
B. It's not the most economically stimulating thing for the schedule.
Rivalries tend to be geographic because close by teams just play each other the most, but being close doesn't make you rivals; playing for stakes does. And that was why the Southeast and Pacific Divisions were killing those teams.
Throwing new teams together in a division made for big time financial struggles for non-traditional markets, because their inventory to sell just wasn't as good as what people wanted. We've talked about "road draws" in the argument over Home/Away vs everyone, and the fact is it's far less about star power or even how good the team is, and more about the traditional brands.
It's simply a function of time/fan base size more than anything else. So Tampa and Florida start playing less home games against Carolina, Washington and Atlanta and more home games against Toronto, Boston and Montreal, and ticket sales increase and they become better financially, which makes them better on the ice, too.
There's simply no reason to realign any more than add one team per division, and if necessary, slide one team over.
Ideally, you do Quebec (Atlantic), Atlanta (Metro), Houston (Central) and Phoenix or San Diego (Pacific). Perfect.
But if necessary, you'd slide someone over (like CBJ to the Atlantic to rejoin DET so Atlanta and Nashville can join the Metro).