I'll answer in a round about way then. I think the last of the four to win a slam will be Justine Henin for two reasons.
First, she seems to be falling into the shadow of Clisters, and this could create some sort of mental block that could affect her play against all of the top players. Second, her playing style seems to place her on surfaces where the best players also perform best.
Momo and Clijsters seem to be more capable on clay so they'll avoid much of the keen competition found on other surfaces.
Dokic's training appears to have worked. I now believe Dokic will be able to hold her own against the top players.
And Clijsters and Henin took 2 top players to three sets. They both play well on clay, and Henin could win Wimbledon if she can play against Venus like she did in her straight set victory over her in Germany.
Momo, and Dokic probably wont win a grand slam til the best are gone completely.
I can't see Dokic or Henin beating enough top players in a row to win any Slams though perhaps with some help from the draw they could.
Clijsters seems the most likely to win one of this group to me and I don't think Amelie will but if she catches fire in a tournament then everybody better watch out.