Joe,
Host country advantage is certainly a factor and we have seen it many times, including at these worlds (Lindemann perhaps, but ABC did not show Lambiel's LP so I don't really know). If Irina is healthy and capable of skating the way she did a few years ago, she will have a chance for the podium.
Yukina is my most favorite Japanese lady skater. However, she is going to need some big jumps to make the Japanese world/Olympic team. I have always liked Shizuka too, and now as the world champion she will most probably make the Japanese team in 2005 and 2006. I am not so sure about Fumie. Like Yukina, she will need those 3-3's.
I never cared for Yoshie' skating, and it was not always the artistry issue. Even if she is able to land a triple axel and improves her presentation, I don't see her among the top ladies. In fact I have seen some improvement in her presentation, but she is a long way from becoming a top skater. Someone else will have to do very poorly for her to make the team.
For 2006 Olys my prediction for the Japanese ladies team will be Shizuka, Miki, Yukina. For the 2005 worlds it may be Shizuka, Miki, and either Fumie or Yoshie, depending on how they do in the GP series. I don't see a sweep with these 3. I don't see Michelle missing the podium if she is at worlds in 2005. Now that Sasha has the monkey off her back, she will be strong too.
In 2005 we may see 1 US, 1 Japnese, 1 Russian lady on the podium (that is, if Irina returns to top form). Otherwise the podium will be split between US and Japanese ladies. Will Carolina be ready by 2005 is anyone's guess but in Turino she will be a contender for a medal- home field advantage!
JMHO
Vash