My answer was more to people that plan an immediate expansion. I don't see it until NHL gets done with other problems (like Phoenix). If Phoenix doesn't move, both Quebec and Seattle are candidates for expansion (as probably a few other cities).
Well, you do have to remember that essentially every single expansion that the league has undertaken since 1967 has been done with one, and often more than one, troubled team in the league already. Fixing currently existing troubled markets before expanding into new ones just hasn't been the ethos of the league the last couple decades, and I don't see that changing now.
As for potential candidates, I do agree that Seattle and Quebec City would be the frontrunners, though you can bet that the league would receive expansion proposals from Markham, Hamilton, Saskatoon, Vegas, Kansas City, Houston, and likely several other markets like maybe Portland, Hampton Roads, and Hartford, though that's not to say that all would be equal.
If I honestly had to rank them, I'd guess....
1) Quebec City
2) Seattle
3) Houston
.... in terms of likelihood in winning an expansion team in the near immediate future, and I don't see Markham or Hamilton getting teams despite almost assuredly being more prepared for one than a couple (if not all three) of the frontrunners I mentioned in a few years just due to opposition from the Leafs (and Sabres for Hamilton).
And I know that Houston doesn't have an ownership group in place, but it's way too massive and wealthy of a market for the league to keep ignoring and I don't have any doubt that a multi-year expansion process would give them time to scrounge together an ownership group in that market.