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Don't forget that Homura already experienced a complete BSoD. It took Madoka's dying request to set her back on track, otherwise we'd get another witch in no time. And the promise to Madoka is what cements her attitude and determination.
Like I said, it's all about protecting someone. Not the world, just someone. Kamijou or not, Sayaka was pretty eager to be a hero, but the circumstances that cut her off any possible relationship with Kamijou hit her rather hard. It was the conflict of images - you're not usually a hero of justice and a soulless zombie AT THE SAME TIME. Since she no longer considered herself human, she basically lost any reason for protecting other humans, thus losing all her purpose and meaning of becoming what she had become. Even the case with Hitomi - remember Sayaka realizing in dismay that after the conversation about Kamijou she actually regretted saving her friend for a moment...
One must wonder - what if Sayaka's BSoD was interrupted not by apple-munching church militants or cold-exterior flashsteppers, but by Madoka trapped in a witch's barrier again? Chances are, it MIGHT have shaped her up a little bit (although I can't bet on it, really), remind her that there's still someone she might want to protect. Alas, we'll never know...
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