I'm with Frida80 in that I don't think Kostner's a factor this season. So, it's really a question of whether Bradie (and it will be Bradie), our no. 1 US Lady, can beat out the third ladies of Japan and Russia and get fifth and then whether Mariah or Ting can pull in a strong enough skate to pull in just behind them--so, say, Bradie fifth, Mariah eighth.
Bradie was sixth last year at Worlds, though she was helped by Japan getting only two spots. On the other hand, Kostner's not a major contender and the Canadians seem to be on a sort of break. The Russians are going to be Zags and possibly two fairly inexperienced younger skaters. Japan will probably be strong, but it's possible one skater will have a weak skate.
Bradie has decent nerves--she's had fumbles, but her skates don't fall apart--and she's already been under a ton of pressure at this point. (Mariah, alas, makes me nervous--so beautiful when it's all working, but consistency has been a bugabear.)
So, I'm not saying I'd bet on this, just that it's not impossible.