Oryx's sisters are not dead like oryx. They continually killed each other to get more powerful. They parted ways eventually
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This is true. I thought it might have been a bit much to explain in this sort of fashion though... That and I was unsure if they would return to life given thay oryx is gone?
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We know that Xivu Arath had her own throne world and savathun probably would to. I'm not sure if they would come to avenge oryx, or take advantage of the power vacuum
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Most likely the ladder would happen as per Sword Logic. The vacuum must be filled and the three sisters can only permanently die in their throne worlds.