I think the only possible U.S medal hopes for Sochi are Nagasu and Agnes, but both have a whole lot of work to do. Czisny will be too old if she even is still skating and makes the team then, and Gao just isnt good enough. Flatt definitely isnt good enough and will probably go off to college after this season anyway. Wagner isnt even a consideration to ever make a U.S world team again, forget contending for a medal.
Maybe being a little pessimistic. I mean, Miki Ando is the same age as Alissa, and she's winning pretty much everything this season. Now I know that this is now and not 3 years from now, that in the figure skating world there's a big difference between being 23 and 26, that the field is a little depleted right now with no Yuna or Joannie, Mao struggling, etc, and that Alissa doesn't have the jumps or consistency of Miki, but it's not entirely out of the question that she could still be internationally competitive come Sochi. I'm not counting on it, but it isn't out of the realms of possibility.
Regarding Christina, she isn't good enough now, but that doesn't mean she won't be in 3 years. She has the most technical content out of all the US ladies right now and one of the only ones with a consistent 3-3, and her jumps are not only consistent but get +GOE. Her spins and spirals need work, yes, but these days they don't count for much anyway, and those things are easier to learn than a 3f-3t, plus she is already getting the levels as is. Her PCS aren't great but those should improve if she can perform well consistently on the senior ranks, which shouldn't be an issue considering her jumps are very solid and she doesn't seem to have any major issues regarding pressure. She's also going to have basically all of Orser's attention, at least for the upcoming season, which should help. This season didn't go as well as a lot of people hoped, but I think that was mainly due to 1.) her growthspurt and 2.) peaking too early in the season. The growing pains should be done, and she will likely figure out a plan with Brian to prevent peaking so early (ie at her 1st GP like she did this season) next season.
This is just my opinion but I think Christina has better odds of becoming a medal contender internationally than Agnes does. Agnes is on a faster track for right now, which is why she's beating Christina, but I sort of feel like she's as good now as she's ever going to be, and could potentially regress. With Christina I don't feel the same way. Agnes has the quintessential Tom Z flaws - slow, a little generic, etc and if she stays with Tom I feel like those weaknesses won't be addressed. Christina, OTOH, has Orser and Wilson on her team, and has already improved tremendously under that team. The other thing about Agnes is her height. She towers over the competition, and for now she can still pull the jumps off because she's thin as a rail, but that might change in coming years and she could end up like Kostner or Phanuef, very talented, but very inconsistent. I know Christina got a lot taller this season too, but she's still a lot smaller than Agnes so I don't worry about her as much. If Agnes leaves Tom Z, then I think she still has a good shot at making the Olympic Team in Sochi and becoming a medal contender, but if she doesn't, I don't know.
Mirai is still probably our best hope, but I don't know if she can really change. I hope she can, but, it's hard to tell. She's so good when she's on, but she's off as often as she is on, and if she wants to be on top, that has to change.
Ashley and Rachael probably won't be factors but you never know. I think Caroline Zhang is done for sure, but I don't feel the same way about Ashley and Rachael. I think a lot will depend on how the up-and-comers fair on the senior ranks.