well...dawn's role so far this season has been "the little sister" not "the key"...so it could be to attract viewers, since those of us who are dedicated know better...or it could be foreshadowy...i hope for the latter...dawn needs to either get important or get gone...
but i think she will of consequence get very important when tara dies, because tara is very much a mother-figure for her now in the absence of joyce...even, i think, surpassing the place buffy holds in her life...i think dawn's emotional importance will grow, but her mystical importance is still up in the air...
more speculation...i think everything also needs to somehow attach to xander finally hitting his turning point toward adulthood...will and buffy already had theirs...thus...the anya role becomes very important...and, i'm thinking, very doomed...
as long as it brings tara back with a minimum of deus ex machina poor writing, i'm all for either anya or dawn or both being the reason for a reset, but i feel like they're both going to get very important in the next five eps...
ooh...it's 4 am...and i'm speculating...hope i didn't ramble too confusedly
braids