Well, despite what folks say, there haven't beenmore reruns. The season is 22 episodes long, and it began around the normal time. There are always mid-season reruns, generally timed so that major sports and holiday events can play, and so that major episodes can run during sweeps time. There havent beenmore reruns, though we may not like exactly where they've placed them this time.
Now, a few thoughts along different lines...
I'm sorry, but Buffy was wrong, and the Scoobies were right. Even if "the power" is at the vinyard, you cannot take it from them unless you know what it is. Caleb has mopped the floor with Buffy twice already. Throwing herself against him again without a new weapon, or new information, is simply suicide. The Scoobies are not an ocean that you can throw against the rocks of Evil indefinitely. Buffy's proposal was ill-conceived.
Now, I'm also sorry, but but being tossed out isn't something Buffy deserves, as if she's been a bad person who needs to be punished, thwapped with the Rolled Up Newspaper of Justice. Getting tossed out is something Buffy needs.
Fans, think back. An episode in which Spike and Buffy have a confrontation, and Spike describes how he managed to kill previous Slayers. It had a wonderful structure of flashing back and forth between Spike fighting Buffy, and Spike fighting Wood's mom. In that scene, Spike says how he managed it - essentially saying that they had wanted it, and were ready to die.
Buffy is about there now, folks. They've made it quite clear in the past - characters in the Buffyverse are not bottomless wells of emotional fortitude. There's a point where they simply break. Buffy, with the weight of the world on her shoulders and no effective power, has reached that point. She's stopped listening to advice, grown paranoid and desparate enough to simply throw herself at the enemy until one of them dies.
It's possible for Buffy to "recharge", but she cannot do it in that house. So long as she is there, the weight will still be on her shoulders. By throwing her out, relieving her of responsibility, Dawn has given her the opportunity to recoup. Now we see if that's enough....
And, as a last thought - the idea that Caleb is somehow tapping into the Slayer power is intriguing. It is consistent with the statement that the First is able to move now due to an "instabilty" that Buffy created. Most folks have focused on the Multiple Slayers Theory - that Buffy's death and rebirth in Season 1 is the source. I have another speculation...
There's another time when Buffy has tampered with her power - when facing Adam. They did a ritual, where Buffy took her own power, and also power from Giles, Willow, and Xander. It made Buffy tremendously powerful, in a Neo-esque stop bullets in midair and turn them into birds way...
But it also pissed the "first Slayer" off. Buffy had used another power. It came, troubled her dreams, and actually made an attempt to kill the Scoobies. Buffy eventually told the First Slayer to shove it. Maybe the mixing with the Scoobies, or the failure to make amends, is the root of the instability.
We've seen that the power the Slayer draws upon is somewhat demonic. The Slayer line is, in essence, and attempt to fight fire with fire. But note the repetition - the First Slayer, the First Evil - perhaps the Slayer is an attempt to fight evil with the First Evil itself. It would then make some sense that Caleb, in league with teh Frist Evil, had a tap into that power, hm?
Anyone notice if we've ever seen Caleb use superpowers when there wasn't a Slayer in close proximity?
Actually, I don't know how it finishes, but I don't think it's going to be completely lame. Also, I don't think an artifact to defeat the First Evil is that farfetched, and it there really is a Slayer Sword/Scythe, then it explains why the Council emphasized martial arts over modern weapons 
