Normally I'm a strong supporter of the policy of National medalists going to Worlds. But in this case, yes, I think Alissa should be removed from the World team. How can she possibly be ready to compete at Worlds in two weeks after a horror show like this?? Two falls in the short, not a single clean triple in the long?? That's crazy bad. And I don't buy the argument that the Challenge Cup isn't a serious competition. Kostner and Joubert were obviously taking it seriously. It's 2.5 weeks away from Worlds. Any competition that close to Worlds is serious.
IMO Alissa should be urged to withdraw from the team, and if she will not do so voluntarily, she should be removed. At times, the federation simply must make a call and step in and do the right thing for the overall skating program.
As to those saying that a 2-fall Alissa might still place better at Worlds than Agnes, Caroline, or Gracie . . . Well. You may be right. But if Alissa skates as badly as she did at Challenge Cup, then again, you may be wrong. And the thing is, Alissa probably just lost some of her international standing, if you will, this weekend, with this terrible performance. That could affect her PCS at Worlds.
I would be fine with Agnes, Caroline, or Gracie replacing Alissa. My first choice would be Gracie, followed by Caroline.