If nobody moves, realignment is a tad tricky with only two real options:
1) Move the Yotes to the Central - seems simple enough, but that'd move them away from by far much closer geographic rivals in Southern California and Las Vegas (the latter being an obvious big deal that both teams would likely hope to establish) and it would create a three time zone division when the playoffs come around thanks to Phoenix not observing DST. An easy work around would be if the league scrapped the divisional playoffs and just brought back seeding the top eight teams per conference.
2) Move the Avs back to the Pacific and then move Calgary and Edmonton to the Central - a bit more clunky, but it keeps both Western divisions at strictly two time zones apiece. The Western Canadian trio would likely moan, but if the NHL could split up the Hawks and the Wings into different divisions I'm not seeing this as being a make or break point especially as it keeps the Alberta teams together.
Neither entirely ideal. Best would be if the Yotes moved to Houston (or Kansas City) making an obvious split between the Central and the Pacific, though obviously not for all 14 Yotes fans.
As for relocation candidates, Calgary still seems like a bunch of smoke with no fire to me. Carolina still seems like the most likely option, and the current split between the current owner and the prospective owner seems almost like a desperate move to delay the inevitable with the league's assured interest to not let any franchise sell for less than what Bill Foley just paid a team for. And with the asking price for a team increasing by $150 million in a few years, that'll likely raise the minimum floor that the league would accept a team to sell for, meaning potential profit for both owners if they want to sell out to a relocation buyer later down the road.