Okay, so I have been reading a lot of people saying that now the Petrova line has completely stopped. To that, I say "How do you know?", in the nicest way possible, of course. For us to confirm that, we need to see where Isobel came from. Which parent did she get her Petrova genes from? Did that parent have brothers or sisters, or even just one sibling? If they did, did that sibling or siblings have children? In TV land, they only show the important members....and since Elena was this go-round's doppelganger, they only showed us Isobel and John Gilbert. Isobel may well have been an only child, but her parent that descended from Katerina Petrova may not have been an only child, or that parent's parent may not have been. I think there will be another Petrova Doppelganger in 500 years, we obviously just won't see it. Anyone care to chime in?