I don't think LA is the ONLY threat but I understand what you are saying.
For how good the Central division is in the regular season, none of those teams except the Hawks have proven anything in the postseason in recent years. Dallas may be running away with the Central division at the moment, but we'll see what they manage to accomplish in the playoffs considering they have very little playoff experience. Blues continue to have difficulties making it past the first round, Wild have yet to prove they can make it past Chicago (was hilarious to see them get swept last year after all the trash-talking from their fans prior to the series). Preds -- not much playoff experience. Jets -- that franchise still has yet to win a single playoff game.
And then the Pacific -- Ducks have their own issues at the moment, Sharks are not exactly known for playoff success, Canucks are in free-fall right now.
Hawks don't need to worry about Eastern Conference teams until potentially the SCF -- and if the Hawks make it all the way there I would have no reason not to have confidence in them.
Experience really does matter. Tampa Bay fans tried to brush it off as being an overblown factor, but look what happened in the end.
I know I know "it's a very different Blackhawks team this year," but the Hawks still have MOST of their core that won three cups, and that would certainly come into play in the postseason. Playing the same team over and over in a best-of-7 series is a whole different animal than the regular season, and the Hawks' core has proven they can step it up when it matters.
They've just got to make sure they actually make the playoffs, though. Getting some scoring from players other than the PAK line would help.