Buffy's story had been told. To want to revisit it for more of the same would be to invite a rehash and banality. Fans may want that, a lot. But it can't be a good story if it just keeps going because fans want to. The seed of the story was planted and was fruitful, but it had an expiration date. The only way the story can go on in a vital way is if the 'verse literally gets ripped apart and remade.
This means Buffy Summers has to die. (At the very least to be send away, imprisoned, etc.) The universe (story) may then freely splinter and tiny crystals tell different tales with Characters that are not Buffy (arcs in season 9&10).
This is the final consequence of it (ironically, spaceporn wouldn't be "Bangel's last hurrah" - but Buffy's last hurrah - we'll see if she gets a send-off by Spike, too).
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This means Buffy Summers has to die. (At the very least to be send away, imprisoned, etc.) The universe (story) may then freely splinter and tiny crystals tell different tales with Characters that are not Buffy (arcs in season 9&10).
This is the final consequence of it (ironically, spaceporn wouldn't be "Bangel's last hurrah" - but Buffy's last hurrah - we'll see if she gets a send-off by Spike, too).