Fear not, seems like the Thrash are pretty much as good as gone out of ATL. Winnipeg seems to be the frontrunner as a potential market ... Hamilton needs to find someone besides Balsillie (who the other owners absolutely hate) to step forward as an owner.
Atl relocating out west would pose some interesting realignment dilemmas. The Preds to the Southeast mebbe?
As far as U.S. cities Portland has a grassroots effort going to get a team (no team between SJ and Vancouver, about a 16 hour drive), and K.C. is still looking for a team in the Sprint Center. Isles have been mentioned a bunch here but they just had an arena proposal put forward today so it'll be interesting to see what happens with that.
Preds have a pretty brutal travel schedule (as do most of the eastern-most teams in the West).
Portland is intriguing, but I think KC is probably going to get a team sooner or later. The NBA seems to be thriving in OKC as the only sport in town and the NHL might look at KC the same way since they wouldn't have any competition from an NBA team.
I think Phoenix and Atlanta are obviously the next two teams to move, with the potential destinations looking something like this:
1)Toronto area (including Hamilton)
2) KC
3) Portland/Seattle/Northwest
Winnipeg/Quebec City/ Houston and other larger US markets without teams would be in the second tier. It sucks because I think a team in Winnipeg would add a lot to the character of the NHL, but if the market can't support it, there isn't much sense in moving a team there only to have it fail a second time.
The Isles have been in arena purgatory forever, but I don't really see them moving, I don't think the NHL wants to lose that market.
Btw, how terrible of a sports town is Atlanta? I know the Thrashers have been terrible, but their support for all of their major franchises really sucks.