:scratch: guanchi, I think it's a bit of an exaggeration to say that ballet as a comparison is "dead"...
When people refer to "balletic" skating I don't think they don't mean the strictest, tightest, most old-fashioned way of looking at ballet (completely different from skating by principle anyway, ballet can never be skating because it's not on the ice and vice versa)--I take it that they mean a skater has superior lightness, flexibility, lines, and ease. I do not think it was anyone's intention to offend ballet "aficionados" by making these comparisons, but rather say a skater has the spirit or fluidity of a ballerina dancing.
I would be sad to see Mao, Sasha, or Alissa drop out of skating to train for ballet for 5 years

Simply because they do not need it--they have developed their own unique beauty on the ice, just as a ballerina naturally adapts her movements to being on ground. It's also quite a shame that you don't recognize the many years of hard dance/movement/flexibility training these girls had to go through as many skaters aspire and train to get those kind of lines. And yes, some skaters just do not have very nice posture, free leg position or flexibility which is what sets the three you targeted (as well as others) out from the rest.
And what is ballet without emotion anyway? What is ballet but a storytelling art at its very heart? What is ballet if it can't change, adapt, or be innovated upon? Dance, as all things, changes with its environment.
Skating is a strange world where one must always keep an open mind.