I had a small idea on how to drag the story out further, across decades even to bring it to the present. Maybe by first delaying Victoria's transformation for a year or so if she goes missing at the Wynter's hands to keep her away from Vail. Then when she is a vampire, she'll live for a very long time working for The Order and she could even take over in the future. Then there is the question of Vail and Victoria standing the test of time, maybe have children.