I actually was hoping that Dawn WAS a SIT. Its all fine and dandy that Xander has accepted his position in the group, but the group doesn't need an additional Xander.
As touching as that last speech was, Dawn really does need to develop powers, either magical or fighting. Its pretty lame that she wants to learn just about everything thast the scoobies do (magic, fighting, xanderesque "dedicated hero" stuff), but all buffy lets her do is read.
Besides, if she didn;t have latent power, why would the first have gone after her in Conversations with Dead People. Xander and Anya were not approached becuase they didnt have power. Dawn, Buffy, Spike and Willow were.